[Unfortunately, that is exactly the kind of person Shun can be and often is, and it's taking all of his self-control to not be here - he's too incensed to even express appropriate surprise at Johan's revelation. If Johan knew the whole time he was from the same world as Fubuki, not only was that first instance careless, but allowing the spirits to be used so extensively in that fight against the jellyfish instead of getting the hell out of there is now a hundred times worse.

At least this tells Shun that Fubuki has the self-preservation instinct to cut and run if things get too bad, but he still doesn't want to risk it. Letting out a sharp hiss to try and lower his frustrations a bit, he levels Johan with a merciless eye.]

If you're going to keep interacting with him, don't be such a careless idiot about it in future. If not for his sake, then for the sake of what I'll do to you if he's hurt because of this.

[There's no hint of hesitation or second thought in that threat. The only reason he's not trying to cut him off altogether is because of his own circumstances with Yuto.]