Rewatch AR's last play against JAX. He wasn't out of gas...
https://www.youtube.com/watch?v=_1VmRbLF8Yo
He got the piss knocked out of him, rolls over grimacing in pain, stays on the ground for a full minute with the whole staff around him. Gets up and limps off the field. In bad enough shape that they don't want him to finish the last :59 of the game even though it's 2nd and goal from the 2-yard-line.
It is what it is. Running QB's have much more opportunity to get hurt.