With the fever gone, she should not still be as delirious as she is currently acting - this puzzles him slightly, but his focus doesn't linger on that for long. His attention is on the collar, getting that off of her.

"It should be simple...Bar told me how to turn it."

He carefully examines the slot where the key fits, and mutters something in another tongue under his breath (a ward, to protect against any errant injury should something go wrong, which it won't because Bar promised the key would work just fine) as he unlocks it. And then works to loosen it from her skin, where it is...stuck?