My wife was talked into firing a potato gun at some friends house. They were using hairspray to fire the gun; however, it would not fire when it came to my wife. The owner of the gun filled it with acetylene gas and oxygen. The gun exploded and severed a nerve in her arm. She has had surgery, but my have permanent nerve damage. Should we sue the owner of the home's homeowners policy for medical expenses or the owner of the potato gun? Thanks