[that helps at least - he shifts too, turning to face takeru. the fluster nearly all but disappears as mineo focuses, apparently only able to focus on literally one thing at a time, instead having feelings of seriousness and almost - protectiveness? - take its place]

... I just wanted to catch you before the meeting. When we start talking about Childe, I'd prefer if you started to tune me out. [a beat] Well, more than you already do.

But if we decide to kill him, I'd prefer if you left the room if that's simpler for you. Because I'm fine with being the one to kill him, but I don't want you to hear the discussion on how.

[because mineo has a gun. and he has no problems shooting it, or suggesting shooting it. he only has concerns about takeru hearing it or dealing with it.]