Haxton River Bet Puzzle for O’Dwyer

Isaac Haxton opened for 9,000 on the button and Steve O’Dwyer made it 29,000 from the big blind. Haxton made the call.
The flop was and O’Dwyer continued the aggression with a bet of 38,000. Haxton made the call.

The turn was the and O’Dwyer checked. Haxton considered what to do for a while and then he also checked.
The river was the and again O’Dwyer checked. Haxton bet 70,000 into a pot of 208,000.

O’Dwyer thought about it, trying to puzzle out what Haxton was up to. He had 230,000 behind and was scratching his head. He took nearly three minutes but eventually smiled and made the call.

Haxton tabled .He did indeed have it and O’Dwyer's stack suffered some damage.