Possible Clues:

• Attack made by puma, firstly, then snow leopard
• Soft and light as one may land on one's prey
• Spring or swoop down on
• Spring (like a cat)
• Surprise attack sending immoral earner round the bend
• Sudden seizure?
• Sudden swoop
• Spring upon suddenly
• The spring sounds soft and is light
• Spring down on and grasp