[@Letter Bee]

Just because a rune glows does not mean Mikhail can immediately know with 100% certainty that this guy is the cause.

I don't recall Donovan standing there and explaining to anyone how his ability works. How is Mikhail sure it isn't some random person elsewhere causing it and Don's rune isn't something entirely different? How does Mikhail know Donovan isn't just a giant flashlight?

Edit: Alternatively, how is Mikhail sure it's Don emitting the aura and not Nico since both simply use glowing sigils to indicate effect?

Anyway, I said I'm trusting [@Scio]'s call on that.