[It's more than just what the Guard can or can't handle. Sato's initial inquiry that sparked the whole outing still nags at her:

["Have you ever thought about what it would take to kill a god?"]

He can't die, for one thing. Not talking about the way most people seem to be eventually brought back by Hope -- you shoot this guy dead, he's alive and kicking a few seconds later.

[Not that... Rey shot him dead or anythi--

[It was an accident.]