Because if you try it and it backfires you might end up dead, dude. [Just a thought. This is how the analytical mind works.] Trust me, I know what I'm doing. I drafted designs for my team's armor over, like, a couple of days. [Because clearly that's a Long Time. Also the fact there are giant scorpions in Merlin's home world disturbs me, I'm so glad. Anyway.

He's absolutely observing the spells as Merlin goes and tests and practices, nodding in approval.]

…they're all spells I've never heard of. [The language, he means. He doesn't recognize it at all.] I almost want to strap a camera to you and send you out to fight real monsters. They never said you were capable of this kind of magic.

[Okay but who's they? We just don't know.]