Is it this play you are talking about?
(If you only want to see the video, click here.)
If Allen later sees Kincaid again, I believe the defender will move his position forward.
And the defender will rush in to tackle from the moment the pass is thrown
Scrimmage is around 42yd, so I think no gain (or loss) is likely
Allen's throw was in hopes that Shakir would go straight.
I don't know if Shakir could have released the defender even if he had gone straight ahead, but the rearmost defender is covering Coleman.
At least it wasn't a dangerous throw of interception.
Pockets are starting to narrow by the time he throws to Shakir, also RT has been breached and he doesn't have much time
It looks like Allen's scrambling run was the only way to gain positive yards here.
But there could have been an unprotected DE there.