Nut Flush, Ngo Problem

After a preflop betting war, Steven Doherty moved all in and was called by Sang Ngo to put him at risk. 

Doherty tabled A♠9♥ and was ahead of Ngo's A♦5♦, but the flop of 7♦A♥3♦ was pretty dicey as both players flopped an ace, with Ngo holding the nut flush draw. Sure enough, the 6♦ peeled off on the turn to give Ngo the nuts and the river K♠ sent Doherty to the rail. 

"Wow! I had king-high diamonds! If I call, you get it all!" Tony Sivorakoune was relieved as his healthy stack would have been decimated in a nasty cooler. 

Ngo - 345k
Doherty - 0