i did n't know they could scream- struggling to stay on , her thighs slipping as his hooves pawed at the air , and he was n't screaming , he was whinnying , but it was a scream and there were other screaming whinnies somewhere behind her , oh dear god , she thought , horses back there , horses back there and the woods are burning- up ahead , blocking the light , that silhouette , that dreadful shape .