Huge problem with operating a turret!
Don’t worry pretty soon the event will be dead and the problem won’t exist.
One thing you can do, though, is turn the turret around and fire a couple #1 shots at the mobs over by the Laser.
Errr, I’ve done turret duty before and I still got the 4 chest rewards. It doesn’t take that long to clean the poison on the area the Zerg is standing. When 30 seconds are left just run/jump back to your turret. Easy.