[A very large part of him wants to just kind of yell at everyone to stop being completely ridiculous and discuss this very serious situation like adults, but he also knows that's far too much to hope for. McCree and Reyes are both too riled up from the fight, so he has to be both Good Cop and the voice of reason. Throwing this kid in prison for the rest of his life is something Jack doesn't necessarily want to do, but he can see McCree choosing that option just to spite Gabe.

He would rather that didn't happen.

So he's quick to step in again, this time sort of physically inserting himself between the two men, even though there's already a hard light jail cell to do that for them. Reyes might not want to dignify McCree with an answer to the question, but Jack will. He speaks calmly, deliberately. Maybe he sounds a little like a disappointed parent.]

That's not how we started out.

[Obviously. Everyone knows their story, sort of. Maybe not the more classified details of being government experiments. McCree is just trying to get under their skin.]

And this is not something we usually offer. [He'll just dispel the notion that they take in criminals on the regular right then and there. McCree is, apparently, worth the risk.] Trust me when I say the authorities would like nothing more than to see you in maximum security prison for the rest of your life.

[We're on your side, is what he's trying to say. Even though he's a criminal. Jack is willing to put in the time, effort, and resources to rehabilitate this kid. Give him another option. Let him make something of himself.]

Which is fine by us, if that's what you want. This is your choice.