How would this hypothetical be sorted out?

[bas2456]

A1 shoots a 3-pointer and is fouled pretty hard by B1. The try is no good. B1 doesn't mean any harm, just the way he contacted A1, it was a hard foul. A1 takes exception to this and decides to deck B1 in the jaw. B1 is smart and walks away.

Before the punch, A1 would have had three free throw attempts coming. Obviously, though, A1 is ejected for fighting.

How is it handled from here? Does A1's substitute still get three free throws?