The Avengers - with Captain America
Captain America: Alright, listen up! Until we can close that portal up there, what we need is containment. ('containment' is the noun of 'contain' meaning to keep control of where the enemies go and not let any more come through)
Captain America: Barton, I want you on that roof, eyes on everything. Call out patterns and strays ('strays' means the enemies that move around free)
Captain America: Stark, you got the perimeter (the 'perimeter' is the line that goes around the outside of the entire area). Anything gets more than three blocks out, you turn it back or you turn it to ash ('ash' is the result of fire, so this means to destroy them with his guns)
Hawkeye /Barton: Wanna ('do you want to' - linking!) give me a lift?
Tony Stark / Iron Man: Right, better punch up (this means 'get ready to fight'), Legolas (this is a character from 'Lord of the Rings' that Hawkeye resembles - funny!)
Captain America: Thor, (you) gotta try and 'bottleneck' that port ('bottleneck' means to make the portal smaller or to protect it so no more enemies come through it). Slow 'em ('them' - linking!) down. You got the lightning... light the bastards up! (this means 'destroy' them).
Captain America: You and me (to Black Widow), we stay here on the ground; keep the fighting here.
Captain America: And, Hulk...smash.