Pats fan here. When I saw it on live TV and on replays, I thought the hit was questionable. But I think this angle from the opposite side will change your minds completely:
 
	https://t.co/0rc5YkIDs1
 
	Allen actually is the one who turns toward Jones and lowers his head. It's surprising that Allen was the one injured and not Jones. There shouldn't even have been a penalty, let alone an ejection. 
 
	 
 
	Jones gives away 50 lbs to Allen. Allen didn't slide and was truly a RB at that point. It was 3rd down, and Allen was going to fall forward for a 1st down if Jones didn't engage him. The other tackler Harmon hadn't really started to bring him down at the moment Allen & Jones collided.
 
	 
 
	Nobody wanted to see the QB hurt, but Jones did nothing wrong here.