R hasn't moved in part because he's so busy concentrating on the words coming from the girl, so much more complicated than groans, and because his knees have locked up. Literally locked up. Bound to happen with a corpse in a permanent state of rigor mortis but usually it happens when he isn't busy doing something that seems somehow important, like he actually needs to pay attention to.

The trapped look on his face starts to come through, his eyes now focused on Beth's face instead of some invisible point past her. His pupils don't dilate and contract with changes in the light, like hers would - they're frozen in whatever position they were when he died, ringed by a flat gray.

"Uggh...." R moans, wishing something as simple as communication wasn't so insanely difficult. "...yuh....yeh...." And now he's stammering. Great. Nothing like being put on the spot. Somehow this doesn't happen with other zombies. "Ye....s....?"