Possible Clues:

• Sink back again
• Sees pale, raw looking behind, showing evidence of this?
• Deterioration concerning Scandinavian nomads, reportedly
• Mistake by sappers — fall back
• Degenerate Republican's falling asleep
• Deterioration of one falling out of tree upside down
• Initially ready to please, suffering setback
• Deteriorate as leper unfortunately
• Deterioration (in health)
• Trained tree to climb, ignoring one setback