Bat motivator got stuck on 3/5

Thanks for response, but I'm not able to kill 2 zeffos now :) 

next time zeffo come around abuse the bug and you'll get to use R5's bad motivator.  kill 2 zeffo then the remaining one can't kill R5 and R5 can't kill him, so bad motivator is able to be used as many times as you need to get the achievement.