Calling Sam had been a good idea, all things considered, and Castiel is glad that Dean thought of it. He's hit with the same visions that Dead had: them wandering around the bunker, never quite getting to their destination. He doesn't think it's the blood, but since they have no idea what is actually causing the memory loss, Cas will fall on the side of better safe than sorry in this case.

Cas shucks off his overcoat and jacket as he approaches the curtain. He glances at Dean as he tosses them into the hamper; he can clean that up later if needed. He pauses with his hand on the curtain. "I can handle it, if necessary. If you and Sam have a case..." He trails off, letting Dean fill in the rest of the sentence.