Gidday Keg, it's one thing to call for Taxi after you given the verbal "start complete clear to disconnect" call and quite another to do it before!!
In JQ's case they were just finishing starting the right Engine and hadn't told the Engineer to go. ( He was still watching the right Engine and wasn't talking in the headset until after they made the Taxi request. )
he then walked away, waved and they moved off.......
Anyway.............