He scratched his mark in the crease. It was ball 6. He wasnt attempting a run. Over should obviously have been called.Wicketkeepers often have a little shy at the stumps after collecting the ball. Usually the batsmen are not brain dead and stay in the crease until the ball is really dead
The fact it wasn't called over means its within the letter of the law and they can appeal if they wish. But it pushes fair play and the spirit of the game beyond the boundaries as far as I'm concerned.
I have really no time for any of those run out attempts, the rules should be adapted to remove the ambiguity in the law about when the ball is dead because we dont shout over every ball. For me this was much more clear cut because
1. Its the sixth delivery of the over
2. There is clearly no attempt to run.