S Fishman what an A-hole.

[JohnnyQuad]

Game is $5-10NLH. The man on the button had just lost most of his chips the hand before. Lady limps in, fishman limps in late position player limps in button goes all in for $103. BB calls, lady calls, now Fishman goes all in for about $1050. All fold back to the lady. She thinks for awhile and folds JJ. At the end of the hand the button turns over AQoff and Fishman shows 4c8c for a flush. Now the guy sitting next to the lady says that is the play she should have made and he could not understand why Fishman would make that play with that hand. Fishman then turns to the guy and says "not to be rude but, if you can't figure out why I made that play then thats sad." I did not understand the play myself but did not want to say anything. Can someone tell me what I am missing here? Why would he want to get head-up with his hand. What does he gain by eleminating the other players by going all-in with such a weak hand? Please explain it to me because I still don'd get it.