New Prescription for Sombero?
It was unclear whether Sombero hadn't seen the initial bet and thought it might be part of the pot. The dealer corrected his error, instructing Sombero to put 5,000 chips in the pot. He did so, and Wu folded.
On the turn the big blind jammed for 20,900. It was a bet with a meaning and accomplished its purpose -- Sombero folded.