... You always act weird. [Honestly can't even recall when this could have been the case. It isn't as if he would ever suspect Merlin of anything, especially not back then.]
[........... but seriously. he can't even imagine Merlin trying to kill him.] Just when I think you can't possibly be more of an idiot, you manage to find other ways to demonstrate it. [ROLLS HIS EYES] At least this is an instance when the incompetence is actually a good thing.