[Seeing as how he is a descendant of a devil and does not take leisurely strolls through the chapel -- no he does not know that Ryuji.

He does know that Ryuji abruptly summoning a mask out of thin air is definitely an impressive aesthetic! ... but even he can sense that Ryuji didn't show him that for purely aesthetic reasons.]

You dare to try ambushing me in my own realm?

[It would be problematic if Hajime got caught in the crossfire of Gundam kicking Ryuji's ass...]

Stand back! Or after seeing the true terror I can render, it'll be quite a sight to see how long your sanity lasts.