“If he’d have tried to turn back towards the line of scrimmage (coming back to the ball) he’s have been interfered with, but he continue moving towards the end line on his own the whole time. “
Watch again. He was looping back, and was pushed by the trailing guy who was behind him, then redirected about 90 degrees by the linebacker who then kept driving.
I’ve watched it many time, he was VOLUNTARILY running to the back of the endzone, which took him out of the play. The trailing guy barely touched him and he never got redirected.