Ruby realized Tammy had probably put a hex bag in the boys' room. She had to go make sure Sam was OK. It was so hard being the only one in on the plan. Talk about a house divided against itself. But, Lillith was right. If any more demons knew about it Sam would find out eventually and that would most likely derail the whole plan.
She kicked open the door. Sam was nowhere in sight, but Dean was writhing on the floor. She considered leaving him and looking for Sam, but changed her mind. He'd be dead soon enough and saving him for now would definitely get her brownie points with Sam.