Running to the ball would have carried him out of the endzone before he secured the catch, he would have had to try to get back across the line and probably didn't know if anyone was behind him. It's physics, go learn some.
He still should have run to the ball. Also, if it was a better throw, he would not have had to, TD, Bills win.
I know, it's a thread about fudging Allen's numbers, because the real numbers aren't looking so good