The thing I'm curious about is why he attacked in the first place. The "kidnapping" misunderstanding was cleared immediately, but last chapter Yuuki called Cecily his partner, and apparently that's what set him off. Anyone who knows her would see through the "disguise", so I can see why this guy would recognize her. But the meaning of partner here should be clearly that of adventuring partner, so why would he become violent?
Yuuki then replied in kind because a chuuni would not back down, and is playing with his food basically, but it's not even clear why they're fighting.