[ Merlin has lived countless ages of being teased. To think this might be the last time he is ever joked around with before he dies (okay, not really, he still has enough time for other shenanigans later today...) ]

Oh ho?

What kind of powers? Like this? Or something else?

[ And then of course he takes what she said earlier to heart even more. ]

Wow, so this is really the first time you're seeing something so amazing! No wonder why you can't help but admire my prowess!