Under the laws of all states in this country, if you are responsible ultimately for the damages at the rental that you occupy to your landlord but the cause of the damages that you have written about is due to a fight between two (2) of your guests who got into a fight and ended up damaging a wall, then these two (2) guests from the facts that you have written are legally responsible to pay for the damages they caused.As such, you appear to have a factual and legal basis to sue these two guests in small claims court for the $450.00 repair estimate if they will not voluntarily come up with the money for the repairs.