I have a bicolor blenny that's does the same, fortunately I've conditioned myself to look at the pump before turning it on now, although he has had a few close calls where he woulda been a snack for the other fish.
I do too. This was just a freak accident. All the food was gone and I was turning the pumps back on by Apex. I saw him swim in just as I clicked on and immediately clicked it back off but the lag was too great. It came on for just a second or two but that was long enough.