I know it's for the kids, but it's in the show, so I'm going to work with it. And it's just cute how despite all the danger and all Lexington's rage, they still love a good show at heart. The dramatic reveal of The Pack's hiding place, cinematic emergence of the ship and a grand entrance, has them mesmerized. Until reality hits and Lexington can see his enemies. Brooklyn tries to hold him back, to make a plan. He knows that the three of them might not be a match for the four. Sure they probably should be able to handle for humans, but they're on their ground, and this is probably a trap. I think Brooklyn understands in a way Lexington isn't capable of thinking about in this moment that for them to have shown up in the first place anyone expected them has to mean that they have something up their sleeve.
Lexington's reckless, irrational drive for revenge is putting them at risk. Because on top of all the other things, Brooklyn and Lexington are the weakest, physically, members of the clan. While Bronx is absolutely a powerhouse, he also isn't going to have the brainpower to figure out traps or help them avoid it.
It's just all around a terrible situation that Brooklyn is now stuck in and just has to go for the ride. But he won't be caught doing something half-assed. Haha. I love his just lunging into The Pack. At least he didn't target the biggest enemy as the smallest gargoyle!! lmao wtf Lex XD