had an occasion where a lions paw in the mix got worse.
had a bad wound that would normally go up by 10 damage every time it got worse. The power of a healing lowers the wound by that ammount. so a [6] power heal means the wound goes up by 4. A [11] power healing would lower the wound by 1. Some severe wounds go up by 10 as well. so the same rules apply.
I kept applying heals to the wound, but never managed to get better than [9] power. However at some point the wound went down by 20 damage to a medium. So it pays to keep at it.