Unfortunately I don't have a log, but I've had problems with the assist command not targetting the correct mob occasionally. I think usually this happens if there are two of the same mob in the room and we're fighting the second one while the first is supposed to be sleeping. I end up attacking and waking the one we're not fighting, even when typing assist <groupmate>. Sorry I can't be more specific.

I'll see if I can dig out some logs! (might be on another HDD though)

I've changed that command a few different times, and it really should be working. I tested it pretty thoroughly (and especially with multiple targets with the same names).