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The real question is why the Patriots’ undrafted safety didn’t understand that when you intercept in the ‘zone, you don’t attempt to run out!
Rocket Surgery anyone?
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Given the way he bounced around the refs might (MIGHT) have decided he caught the ball in the field of play and went back into the end zone. If he kneels then that’s a safety. It’s really hard to tell on the replays where he caught the ball, but he definitely went backwards voluntarily some time near or after the catch. Getting out of the end zone was the right move then, don’t take a chance on a “further review”.