He heads for the shore of the island. Most of the other creatures have fled by now. Those who remain are in the process of fleeing.

His blood freezes the water's surface solid enough to walk on. He catches one of Isabella's hands, pulls the shoe from it, tosses the shoe out over the ice - it hits the edge of the wide frozen ring around the island. When he gets the other shoe, he throws it in the other direction, and it reaches open water and floats there.

If James is mobilizing forces - and she must be, if Isabella reached her with the scepter, if anyone has found a knight - she does not seem to be mobilizing them fast enough.