"You're a jackass!" Sam snaps back. "And don't even think about trying to zap my ass, I've got something to get you back!"

He's just talking smack, the way he falls back on in battle - but he sounds angry, gritting it out between shooting at the wildlife attacking them, and he is real damn annoyed that Psii is actually trying to get him to leave. Sam's had enough of self-sacrificing jerks lately, he's not going anywhere.

When he hears someone shouting his name, he turns, wand up and ready - and then changes his aim when he sees that it's Clint, zapping over his partner's head at a bat.

"The damn things just keep coming!" he shouts at Clint.

It doesn't occur to him to tell them not to shoot at each other.