On a -board, Jens Lakemeier in the small blind had both 28,000 and his cards open in front of him. His opponent, cutoff Julian Stuer, had 102,000 in front of him and his cards closed.
The floor and some players from other tables had gathered. It turned out Lakemeier had bet the river for 28,000. Stuer had put in a short cylinder of chips which Lakemeier had interpreted as a call. There were some 25,000-chips mixed in, though, so it was in fact a raise and not a call.
Lakemeier's hand was still live and he had the option to call or fold, raising wasn't allowed anymore. Lakemeier eventually folded, leaving the pot to Stuer. On top of losing the hand, he also received a 4-hand penalty.