Enjolras shakes his head: no, he doesn't know Rollo. He hasn't met any of the Northmen, actually, but he's heard about them (and the moral dilemmas they pose) from friends.

"That's a clear cause."

It is. Enjolras has hesitated to embroil himself in others' worlds, others' causes, blood spilled and death dealt on someone else's word with only one perspective on the parties involved. Killing is too much a line in the sand for him to be easy with that -- although standing aside is another moral choice, and that doesn't sit well either. But seeing women and children to safety from a vile ambush, now, that's clear.

It doesn't matter what the fighting men of the village were doing, for that. Even if they were off to sack Paris -- even then, Enjolras would fight to defend their helpless civilians at home.

"It's good, it's very good, that you could help those villagers so."