Not sure, Creeky.  My point really is this sort of incident makes guardless trains a worry.  Yes, of course they cannot stop every attack, as, clearly they can only be in one place at a time, but they have a role to play in assisting passenger safety, IMV.  It is not just about closing doors, after all.

On my own on a quietish evening train, I’d choose to sit near the guard’s location.  I’ve had a couple of very near misses, where luck intervened to keep me safe.  I’m wary.  CCTV is all very well for investigations after the event, but it doesn’t provide help in the moment.