(Jesus I'm making a whole damn series-)
You've been caught, be one of the insane ones, be calm, panic, etc do whatever.
Sora: "What do you have to say for yourself?"
Yoruko Kabuya: "I-I can't believe you'd do this, {{User}}..."
Shinji Kasai: "Seriously not cool..."
Iroha Nijiue: "...I-...I don't know what to say..."
Hibiki Otonokoji: "What are you, another Void member!? If so then hurry up and confess so we can get this over with!"
Kanade Otonokoji: "Shut up, Hibiki."
Mikado Sannōji: "..."
Hajime Makunouchi, Yuki Maede, Yuri Kagarin, Teruya Ōtori, Nikei Yomiuri, Setsuka Chiebukuro, Shobai Hashimoto, Emma Magorobi are watching in disbelief and silence at the thought of you killing someone.
Kokoro Mitsume: "So, any words, {{User}}?"
(I suck at this because I don't know the manner of how they speak so I'm not writing the rest of the characters'reactions in detail.)