There are two easy ways to kill a paper tiger.
The quickest way is with fire. It destroys the tiger; nothing remains. Maybe the fire gets out of control and destroys the torch-bearer, too. You never know.
The slowest way is with water. Draw a warm bath where the tiger is safe and gets some rest along with the opportunity to finally heal its wounds. You might end up with a friend afterwards and you might not; and you will definitely end up with a kitten at the end.