[Okay, so all these reactions make a fair amount of sense, except... Setsuna's, which just has Gilgamesh going bug-eyed and shouting at him in indignation. Good going, man.]

How dare you accuse me of such underhanded deception! I'll throttle you...!

[And he certainly tries, and mostly manages to wriggle out of Vietnam's grip, but he trips again in his effort to stand. Dramatics aside, it doesn't look like he's making that part up—nothing's broken, but the area's still tender and putting weight on it immediately proves itself a less than stellar idea.

Ultimately Gilgamesh just ends up grumbling, irritable and now very much offended thanks to Setsuna's bout of incredulity.]

Unbelievable... disrespectful...

[Coughs.]

So, who saved cake for me? We were going to eat some together, weren't we?