TOC AA vs. KK hand

[betgo]

I was interested in how Reese played the hand where he had KK and Helmuth had AA. Reese raised, Helmuth reraised, and Reese flat called before the flop. Relatively low cards fell on the flop and turn. Helmuth bet on the flop and Reese called. On the turn Helmuth bet, and Reese pushed. I wasn't completely clear about the bet and stack sizes from ESPN, but this was early in the tournament with reasonably deep money.

I assume Reese didn't put a third raise in preflop because he was concerned that Helmuth had aces. However, he was willing to put all his money in after the flop with undercards on the board. I wouldn't think he would be trapping with KK, but he played it as if he was.

Did he put Helmuth on AK or AQ? Obviously on the turn he could beat other big hands Helmuth would have raised with, such as QQ. Was he afraid of aces preflop, but his read changed?