arm stuck after an almost-held ball

[rsl]

This seems to happens once or twice per season:

A1 and B1 both grab a loose ball. Before a held ball can be called, the stronger A1 pulls the ball loose and pins one of B1's arms against his body.
B1 is now in a position where he could be called for illegal use of hands, but he didn't get there by choice.

What would you call if:

1) B1 is trying to extract his arm but he cannot get it loose
2) B1 continues to fight for the ball or knock it loose with one arm

Held ball, no-call, or foul on B1 in each case?