WSOPE London: Antoine down to 80k

Antoine is down to 80k after the loss of a couple of big pots. He was down to 150k when the TV table was broken down, and he was moved to Table2.
On the blinds 1200-2400 ante 300, Antoine raised 7000 in middle position, called by the small blind. Flop came K45, with 4 and 5 of hearts. The SB checked, Antoine checked. Turn was 9 of hearts. SB checked, Antoine bet 11k and the SB after a long deliberation, pushes all in for 40k more. Antoine makes a very nice call with KT and the King of hearts, so top pair and flush draw. SB showed AQ, with the Ace flush draw. The SB was basically drawing for an ace or an heart. And the river was the 8 of hearts... Bad luck