Tyrique Stevenson was taunting the crowd while the ball was being snapped on that fateful play. He didn't even cover the guy catching the tipped ball, something you're supposed to do when you're playing that kind of a prevent the Hail Mary defense...
Still, it shouldn't have come down to trying to defend a last second Hail Mary.
The bigger blame goes to Caleb "Fingernails" Williams. He foolishly took a sack instead of simply throwing away the ball, that pushed them out of field goal range. He also lost that fumble on the exchange on another drive. That, plus he stunk up the field with his passing performance, going 10-24, while taking off running right as a receiver was breaking wide open.
Link: https://x.com/joe_abdo/status/1850688286022406264