Once outside, Hendrik spots Voldemortist on his way to the forest.Thinking to himself,

"Good Googly Moogly! The forest! If he reaches the forest he will be able to Apparate....the Book will be lost....and both our world and the Muggle world will never be the same.....must reach him before he makes the forest..."

He points his wand at several of the bushes and shrubbery, transfiguring them into two Cockatrices. Hopefully they would slow Voldemortist down enough so that Hendrik could get to him.