Marius' aloofness doesn't exactly come as a surprise. Enjolras remembered his propensity for falling into adle minded reveries quite well, which had in fact called all the more attention to his sudden sharpness and attention on the barricade.

"It is quite jarring," he agrees, passively. Even Enjolras isn't always up for a debate, and besides which, his allies here could be counted on one hand. Any relationship he has with Marius, however secondhand or tremulous would be better preserved if he could find it within himself to hold his tongue. He studies Marius, searching for the correct path to pursue; the proper way to snap him back into the man from before who had been so brave in the face of all their deaths.