Well. Shit. That's dark. Especially when they're still watching the memory, of a Brand who was already so prepared to protect his partner even so young, a Brand and Rune who aren't aware of the losses in their future.

Everyone who you were raised by and around being murdered by unknown forces for unknown reasons is...

"Fuuuuuck," South says, because yeah, yeah that'd do it. She'd have been satisfied with a 'this is making me think about other things' or even a 'nope, not okay', but that certainly makes a point. "...sorry, dude, that's... well, you obviously don't need me to tell you that's fucked."

There's no over the top pity or anything, because that's not what South does, and it's not the kind of thing she'd appreciate in his position, and he doesn't seem the type who would either.

It's clear she's not going to pry further. It's a damn good answer for why he's clearly not okay.