David Ortiz charged the mound on Friday. What he thought he was doing was putting an end to some half-baked intimidation tactics from Orioles pitcher Kevin Gregg. What he actually did, however, held significantly more interest. With one inspired charge the guy tore open baseball’s unwritten rulebook, giving us a good look inside; before the game was done, the Red Sox and Orioles touched on no fewer than five distinct sections of the Code.

To recap: Boston hammered the O’s for eight first-inning runs, highlighted by Ortiz’s three-run homer. By the time Ortiz batted in the eighth, the score was 10-3. Gregg—Baltimore’s closer, in the game to get some reps—threw three inside fastballs to him, two of which forced Ortiz to jump backward.

After the third, Ortiz took a few steps toward the mound, pointing and shouting. Dugouts emptied, but no punches were thrown. Once order was restored and the at-bat resumed, Ortiz popped up Gregg’s next pitch to right field. As he ambled toward first, Gregg lit into him verbally, inspiring Papi to cut short his trot in favor of a sprint toward the mound. (Watch it here.)

Enter the unwritten rules.

• When your pitching staff can’t seem to slow down the opposition, make things uncomfortable. Boston had abused Baltimore pitchers to that point, scoring 20 runs over two games. (It was part of a five-game streak in which the Orioles gave up 10 or more runs four times.) A pitcher can hardly be blamed for trying to gum up a roll like that.

What’s unknown is whether Gregg requested entry into the game specifically for this purpose. As it was, the right-hander did everything by the book. Drilling a hitter for his team’s success is usually unnecessary. The pitcher’s job in such a situation is to move a hitter’s feet, make him uncomfortable, get him out of his groove. Gregg wanted Ortiz to think about something other than hitting another homer, and in that regard he was wildly successful.

“I take offense to every run scored off every one of our pitchers . . .” Gregg said after the game, in an AP report. “You get tired of getting your butt kicked every night when you come in here, and I’m going to stick up for what’s ours and try to get the plate back.”

This leads to a corollary rule, exhibited here on a purely theoretical basis owing to the fact that Gregg probably wasn’t trying to hit Ortiz (but presented in case he was):

• Hitting a guy intentionally is harder than it looks. “As a pitcher, your preparation and your mechanics all prepare you to throw the ball to a spot, usually to the catcher’s glove, and that’s where your focus is,” said former pitcher Shawn Estes, who famously missed Roger Clemens while trying to retaliate for the Rocket’s shenanigans against Mike Piazza in the 2000 World Series. “Well, it’s tough to take your focus off that and try to hit a moving object. . . . It’s not as easy as it looks.”

If Gregg missed his target—three times—he wouldn’t have been the first to do so.

Other pieces of the Code in question on Friday:

• Don’t swing at a 3-0 pitch with a big lead late in the game. The fastball that Ortiz popped up came on a 3-0 count, with his team holding a seven-run in the eighth. That’s domain in which a pitcher unequivocally expects a freebie. (With such a lead, say the baseball Gods and Kevin Gregg, it’s the least a hitter can do.) “It’s 3-0, they’re up seven, and I think there are some ethics to this game and guidelines that you have to stay within,” Gregg said in the Boston Herald.

There’s little question that the pitcher was sending a message with his inside fastballs. With that swing, Ortiz sent one of his own.

• Run to first base like you care. This is where things got sticky. Ortiz, clearly unhappy to have hit a short fly ball, took a few sad steps toward first before starting to trot. Had Gregg not been predisposed to friskiness, it’s unlikely he would have taken umbrage. But keyed up as he was after Ortiz’s 3-0 swing, the slight delay provided all the provocation necessary for the right-hander to profanely urge Papi to step it up.

Plate ump Mike Estabrook tossed Gregg immediately, but it wasn’t enough to keep Ortiz from turning and charging. He ended up throwing several punches (none of which connected), and benches again cleared. Ejections (primarily Ortiz and Gregg) followed.

• Everybody joins a fight. This is a no-brainer. From The Baseball Codes: “Most of the Code is about respect for the opponent, but this rule is about respecting teammates. It’s the most basic of sacrifices, and the fact that the majority of baseball fights don’t involve much actual fighting is almost incidental; it’s a matter of loyalty that can’t be ignored. Hall of Famer Ernie Banks called a player’s failure to join a fight ‘the ultimate violation of being a teammate.’ ”

On Friday, Boston’s Josh Reddick took this rule to an extreme. He was on third base when Ortiz hit the ball, and tagged up. Once hostilities erupted, however, he headed for the mound rather than the plate. That was enough for the umpires to declare him to be the third out of the inning.

As if to take things a step further, Red Sox infielder Marco Scutaro—all 5-foot-10 of him—was the first guy to reach Gregg (6-foot-6, 230 pounds), and as such was tasked with trying to slow the big fella down. It can only be seen for a moment in the game footage, but Gregg offers an inadvertently impressive show of strength, tossing around a clinging Scutaro basically by waving his arm.

We could also get into the concept of waiting for retribution, as Sunday’s series finale featured three HBPs and one near-HBP, most of which were likely unintentional. (It was Red Sox pitcher Kyle Weiland’s first big league start, and neither of his hit batsmen bore any hallmarks of intention; also fitting that bill was Orioles pitcher Jeremy Guthrie, who hit Kevin Youkilis with a changeup.) If there was a message pitch, it came from Mike Gonzalez, who in the sixth threw a fastball behind Ortiz.

After that, though, all remained quiet. Gregg had his say, Ortiz had his own, each club followed up and everybody moved on. Wildness has its time, but so too does order. It’s the Code at work, and it’s a beautiful thing.