He played just over a minute and half over the allotted extra time
Having watched the replays now, it's clear he looks at his watch about 5 seconds before the shot leaves Alli's foot - what I can't fathom is that not one of the Halifax players would have been aggrieved if he'd have blown up with the ball in that position - and yet he's let it develop to a position of extreme controversy instead.
Why not just take the easier route as a referee?
The difference between top level referees and those at this level is often emotional intelligence - say for example one or two of our players are in his ear, he's decided to strop and drag things out a bit - and much like a dog chasing a squirrel, he hasn't really thought about what to do if the unthinkable actually happens - hence losing complete control of the subsequent shootout?