Just saw this on Twitter.
Defense has only 10 men on the field when the is snapped. Runner makes a long run before being tackled by a player who enters the field well after the ball is snapped and after the runner approaches his area.
Several posters, of course, praise the defender for the hit and say it was legal. Some even said the defender was in the field of play when the ball was snapped, but if you watch the play, he wasn't.
Is it legal for a player to come onto the field during a live play after the ball is snapped?