"He who marches out of step hears another drum." ~ Ken Kesey
If it's a small spot of ink give the him the spot remover gun and move on, I hate to make a mistake and cuss my own self out about it but hey it happens. Oh and the if the catcher catches the first one your printer has already printed at least 10 to 12 more depending on the size of your press
We stress our puller needs to catch the issues for this reason, the catcher checks as well though and it sucks when he's the first to see it.