There is no belief in Vash's expression, but he has no choice. It's let them fall or accept his brother's help.

They'll be able to get them up onto the ledge again, but as soon as they pull the three to safety - the dream sends an endless wave of werewolves that descend upon them. It won't matter how many Knives tries to kill. They'll keep coming. Taking Cyril to rape him while the children are eaten alive. It's the way this dream always ends. Either the boys fall or are taken by the pack.