Most of the Witch-King's servants fear fire- including the Witch-King himself. Mind you, be careful about the exceptions.
Palanfirith, there are of course more on you, as originally described there were three, and they are not all dead!
But by now you have all managed to scramble near the fire. The birds cease with their tearing and biting and- if it is possible for a bird to do dos- give you angry looks before disappearing into the night.