As soon as the inn came to Rein's spatial range, he immediately became serious and teleported to the location. He was in a hurry was only able to briefly inform Lopas and Luna that they Mertha and Flora were in danger.
A fight had started in the inn and the guards who were defending the inn were being overwhelmed. Some kind of special poisonous gas was used which was making all the mages working for the inn to feel uncomfortable and weak. As the mages from the attacker's side had already taken an antidote to whatever poison was in the gas, they were perfectly fine.