Aziraphale hears a sound like a gunshot and the two of them tumble backwards even as he reaches out and tries to stop them from doing so-- kind of hard to do with a sword in your hand and a semi-permeable enemy at bay.

"Away, fiend!" he shouts as he runs over and just throws healing miracles in their general direction, as much power as he has - which is probably stable but in no working condition - and starts to rip off part of his clothes to act as bandages.

"I think I'm going to need you both to get in this cart so I can push it," Aziraphale remarks, trying to hide the panic in his voice and utterly failing.