Dean hadn't gotten the location from Sam on where to meet up with him. He'd found out where his room was and he was already gone by the time he got there. He'd looked around and finally found the basement of the place. Hearing raised voices down a hallway he sped up his pace and turned down a hallway in the direction they were coming from.
He saw Sammy carrying Jess in his arms, blood was everywhere, and it didn't look pretty. Locking eyes with Sam he came forward drawing his gun just in case the clown faced freak was still moving. "We'll get her patched up Sam. You wanna go on ahead and I'll go take a look?"
Dean decided to take care of the bastard himself if Sam hadn't already finished the job. He figured that his brother probably wanted to get Jess to a safer location before working his anger out on the freak.