Originally posted by Shawn Doherty:
wasn't an infraction
This just isn't correct though, just because an infraction has no penalty associated with it, does not mean that there is no infraction being committed.
Players are entitled to stop a match whenever they believe a rules or policy violation has occurred, and a rules violation has definitely occurred (they've missed their trigger).
I'd definitely investigate, insomuch as ask “What's happened, why did you feel the need to stop the match”, but you're almost never disqualifying a spectator; simply because they're never going to be so brazen as to turn around and say (or elude to) "I'm making sure my friend doesn't miss their trigger because ".