Sam had caught wind of the djinns going after his brother right around the time Samuel had saved Sam from them. Revenge was a dish best served cold, and apparently the time had come.

He had been keeping tabs on Dean and Anna ever since he had gotten his bearings after coming back to life. Staying in shadows, poking his head around corners whenever he happened to be in the area on a job.

They had both moved on. Hell, they were both happy and Sam could even see the spark of something starting back in them at a stage they probably wouldn't even notice it at. But he did, being the outsider.

They weren't fighting. Between the two of them, that meant a lot.

But he hadn't seen the djinn in Dean's hotel room until the shadow went across the shades on the 5th floor. By the time he got up and found the room, they had already poisoned him. He took the djinn out and gave his brother the antidote, but he wasn't going to leave until he saw his brother was okay with his own eyes.

Even if it meant that his shadow hiding ways had to end as a result.

"You're gonna want to take it easy," he said, relieved and trying not to look too excited. "Drink some water."