Thaler Must Show First

On a board of {7-Clubs}

, Gabe Thaler fired 2,500 into his opponent from the position of the small blind. The other player was acting out of the big blind and made the call. After the river came the {3-Hearts}

, Thaler began playing with his chips for a minute or two. He then tapped the table for a check. His opponent checked behind after a moment of hesitation.

"Queen high." announced Thaler, but didn't flip over his hand. His opponent nodded his head and waited for Thaler to turn up his hand. Thaler then turned up {Q-?}