uhhh i've been in a situation where a remote human took over before
it's rare but it can happen (or at least it could 1.5 years ago-ish)
the specific situation was a tight alleyway with cars parked on either side and people doing things like opening car doors and crossing randomly. the waymo obviously wanted a much wider safety margin than what was available and stopped to wait for things to clear up. the remote human driver instead drove more aggressively towards the pedestrians so they would clear the road.