[He'd opened his mouth to explain while Subaru spoke, not getting any words out as his twin was saying "I know this is what you wanted", and confirming for him that in the end that's what they were both thinking of. For a moment he just stands there, lips parted to talk but just... staring at his brother, so broken by this.]
[Kamui doesn't know if it's a strange mix of guilt that comes despite his lack of sincere remorse... but he closes his mouth, doesn't explain. What could he say? To Subaru, the comfort would seem empty, the excuse flimsy. He still intended to kill Seishirou, and that hadn't changed, right?]
[Soft, since there's at least one thing he can admit aloud.] It wasn't supposed to be like this.