[niss]

If you think the guy behind you has A2, he's not folding here. Bang the hand and 3/4 him. Also, get rid of the other guy (or make him pay). He could also have A2 or a spade draw. Or maybe he's got A3 and is stupid. Unlikely he has 7-8. Maybe he has 3-7, but if you need to rule out every possible hand before banging this one, then you'll never win.