While the shape of the cross wouldn't do anything to him, Klaus's blood was very dangerous if it entered a vampire's system. Devin may have found that even touching it would cause a tingling or stinging sensation.

Whatever mental ledge Klaus had been teetering on, Anton's name yanked him back. At least enough so that he stopped in his tracks, still poised to strike at any moment.

This was definitely not the man Valdis had sparred with - Klaus here was a man at the end of a frayed rope, and he looked ready to tear Devin to shreds.

He didn't say a word - he reigned in the cold fury enough to allow Devin to speak his piece.