[ A friendly banter, discussion about killing one another. That is already something he never expected to have with his darker side, that it happens is such incredible progress— Caster was to answer something with a challenge, how next time he will be the one to kill Berserker, but with enough playfulness.

But then he says something that makes Caster grow serious. Confused a bit, but also curious. Maybe even worried.

This might be the time when Caster does pry ]

Are you worried about me? [ Berserker is thinking about the possible consequences of his actions. Consequences that won't affect him. ] Neither of us is a type to sit inside the safe walls, not in city like this. We can take care of our own trouble.

[ It can't be a subtle "stay out of my way and don't give me trouble" because neither of them is really subtle about things. ]

To ease your concerns, let me suggest this: if one of us gets in trouble for overstepping of another, we could pose as twins. [ Even in fully human forms there are slight differences between them, that are enough to differentiate them. And that's a better explanation than a convoluted explanation of their identity ] Drop me a line and I will bail you out.

[ Even if it means getting arrested or whatever. His mistakes are his own mistakes, he owns them, then moves forward. ]