That's theoretical though, it's most likely not going to happen if they aren't running in the direction that your team mates died. More than likely they are actually baiting you away so the Warlock can Rez, revive their other team mate and come hunt you down. But depending on where their team mate is, if they do run away and your standing guard waiting for the Warlock to Rez, you're just giving the guy running away time to grab ammo and take shots at you