Answer: Your "friend" should immediately consult with an experienced landlord tenant attorney as there is additional information which will need to be gathered in order to achieve the best possible resolution.
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I agree with the previous answer. The friend is liable for 6 months of rent to the tenant + additional cost. If the town finds out he may also get fined by them. It would be very beneficial for him to speak to an attorney on this matter.
Ms. Ginzburg hit it on the head. Your friend is going to have to move gingerly. I would have everything reviewed and see if there is another basis to get the tenant out and pray that the tenant is unaware of the penalty.