Possible Clues:

• One might have a down on them
• Game over? Everybody hides outside
• Bear thus to make progress with steady par round?
• Down on them; they're nothing but quartets (3, 5)
• On these, you're on hands and knees
• Both arms and legs
• Hands and knees - crawl on them
• On them, notwithstanding
• Be on .. . .. . . . to crawl on hands and knees
• Position for playing horsey