Minnesota
Ok, say you move into an apartment with a friend, and you end up, by mutual agreement, moving out a couple months before the lease ends due to various circumstances. The roomie agrees to rent the apartment by herself since she can afford it, and you both sign the lease stating as such. There are no penalties in this situation.
Here's the problem:
You paid February's rent on Feb 4th, and signed off of the lease on the 7th.
Aren't you entitled to the pro-rated remainder of February's rent? When the person in question went to request the remainder of their rent back, the rental office told them they had to sue the ex-roomie who still lives there. That makes no sense, as the rent was paid to the rental company, not the roomie. As I understand, the roomie is not a party to this action.
Who should they sue?

