If you fail to plunder a pile of fish and your cat gets caught, he'll be in for a treat! After that, she has to pause a little before she is ready for a new attack.
You can simply wait for your cat to recover, or you can use energy to speed up the recovery process.
If your cat is attacked by an opposing player, it will initially be flattened. To heal them, you can wait or use 10 fish directly.