Adrenaline is pushing him forward. There's no sound from him when her teeth sink into his arm and he doesn't stop running (any attempt she makes to squirm away will be met with an ironclad grip).

Not for a good fifteen minutes or so does he begin to slow, then stop, turning to look toward where they just came from. Then he'll glance down at the ferocious bundle he picked up, frowning as he loosens his grip and finally allows her to escape.