Possible Clues:

• What could be better than cheap summer skydiving practice?
• Golding's novel released before autumn
• Unchecked descent
• Skydiver's start priceless trip?
• Rapid decline due to brawl after losing gold
• The effect of a drop in gravity?
• Make a rapid descent -- or abandoning fight!
• Unstoppable rapid decline
• A quick drop before opening time?
• Rapid decline of independent initially frustrating to everyone