WSOP Pot-Limit Omaha

[JackWhite]

There is a play I still cannot understand from last night's Pot-Limit Omaha final table.

The flop came 6-A-6. It is checked around. K on turn. Checked around. A on river for a 6-A-6-K-A board with three clubs.

Hellmuth makes a flush and bets, Williamson makes Aces full of Kings and raises, and the raise is for a decent amount of his stack.

Allen Cunningham then re=raises with just three aces. Cunningham is a great player, but does anybody understand that play? When there is a flush draw and a pair on the board, how can you re-raise with just three of a kind, especially when the original raiser put in a most of his chips, therefore, probably not on a bluff.