Finding Dean, bringing him to the bunker, and cuffing him up to a chair was one thing, curing him was another.

Sam plunged another syringe of purified blood into Dean's neck that caused him to scream out in pain.

Sam stayed a little but eventually left, unable to see his brother in such pain.

"What part of I don't wanna be cured don't you fucking understand?!" Dean yelled, the muscles of his face flinching.

His face was covered in cold sweat. The purified blood was causing him a lot of pain. The Mark was fighting back but the purified blood was also strong.

Dean still had a few more shots of that blood coming.