Some of the mounting pressure leaves him at Cap's touch, and Billy tries to release that anger, giving a begrudging nod and taking a half step back.

He promised. And Avengers don't kill. Or hurt...'innocent' people. And while she's a horrible excuse for a human, that doesn't justify using his powers against her.

"...Let's find Tommy," he agrees, and then he looks with a touch of apprehension to Cap, because while he can easily just pick him up and speed away...this is Captain America. Toting him off bridal style feels a bit...wrong, and he needs some sort of permission before he tries anything.