Did the mentor explain? Was it acknowledged that they were new? Was there warnings on what was being done wrong and how to correct it? How many wipes did it take?
If he was warned what he was doing wrong, and continued to do it, then they are beyond a Mentors help and are just holding back the alliance in such a fight. You need more details about what actually happened, all you did in your OP was sketch around it to purposely villainize the Mentor.
