I say shoot then ask question. Your life and kid's life is in danger. Shoot it then find out what it was. He gave it warning by screaming and fighting his flash light. Even if human you better say something your be ready to me your maker
LOL, if it was a human growling at you, you might be doing them a big favor
Anything that growls at me when I'm in my tree stand (specially with my 11 yr old daughter) has made a very bad decision...