Tyrann Mathieu's personal foul on the 2 pt conversion

They need to limit the roughing the passer calls outside the tackle box, or else just ban QBs from running, or at least ban them from running out of the shotgun.

What is Mathieu supposed to do there?

/sarcasm on/ Allow a 5 yard halo for Mayfield to make up his mind whether he's a runner or a thrower? /sarcasm off/