While Gipsy is the one doing most of the work, Herc is still walking inside her, moving his limbs in tandem with hers; he's not sure if it's helping her at all or if it's just annoying, but it's become such a deeply-ingrained habit that he can't help himself. He'll just keep on keeping on, as it were, until she tells him to stop.

He's reluctant to stop, actually, since Gipsy is enjoying herself so much, but eventually he knows he has to call it off.

Gipsy, love, I think it's time we head back. He can sense how tired she is now, how difficult it is for her to hold so much back and do most of the work herself, especially since she's not fully recovered yet. He doesn't want her to push herself too far and end up doing irreversible damage to her internal systems.