[ Merlin puffs his cheeks out, but then realizes Wei Wuxian is being serious and he can't play it off with humor. He takes a moment to take in the fact someone's worrying over him...a little? It doesn't happen very often, so he's a bit surprised as well.

Fou, on the other hand, looks plenty satisfied about whatever concern that was just voiced. As well as more pet ruffling, making a little happy noise. ]

Aha, I'm not even sure if what's behind it is a creature or not, but...

Well, I'm working it out, okay? [ He pitches his voice up cheerily because he doesn't want to sound otherwise. ] I'm the great and powerful Merlin! If anything went wrong, it wouldn't be because a spell back-fired on me, I promise. Someone would have to interfere or kill me first to stop it, of course. Naturally, I won't let either happen! I'm good at running away when it gets too dangerous.

Have faith in me, alright? The best thing is I'm not going to just rush ahead into it either. I have a plan. It's important to gather information first before taking action, right?

[ Which, he assumes will afford him enough time to potentially take action in the first place, but...you know. ]