Alligators?

 

All he knew was that he had to head for the water but when he opened the door, the parking lot was full of alligators (or were they crocodiles, he never could remember how to tell the difference; he knew that one of them lived in fresh water and one in salt water but then there were the crocodiles in the Everglades so who the hell knew) and he ran, with them close behind him, remembering that they could run at 30mph for long enough to catch him, but they didn’t- they thundered past him and dove into the water.