Henry Kuttner 
What Hath Me? 

The man running through the forest gloom breathed in hot, panting gusts, pain tearing at his chest. Underfoot the crawling, pale network of tree-trunks lay flat upon the ground, and more than once he tripped over a slippery bole and crashed down, but he was up again instantly.

He had no breath to scream. He sobbed as he ran, his burning eyes trying to pierce the shadows. Whispers rustled down from above. When the leaf-ceiling parted, a blaze of terribly bright stars flamed in the jet sky. It was cold and dark, and the man knew that he was not on Earth.

They were following him, even here.