If Predators can't escape with their meal it's probably because they would never have been dumb enough try for it given the odds
Have the predator follow the party and wait until they are separated for some reason before they attack. Or have them attack the archer pinging away at the back in the middle of another fight.
Have the predator follow the party and wait until they are separated for some reason before they attack. Or have them attack the archer pinging away at the back in the middle of another fight.