Rock, Paper, Scissors... EVAN style!

For some reason, our dinner conversation moved to the rock, paper, scissors game.  Nathan said he had played it at school before, and that it wasn't a very fun game.  I told him he'd just not played with an RPS Master.  "What's THAT?!" he asked.  "This," I said, as I proceeded to play him in a fierce round of the game.  After we had a few minutes of fun and laughter, Evan said he wanted to play.  I explained to him how to play the game and he joined Nathan and I on our side of the table.  I chose scissors and cut their papers. "I won that one, guys."  Next round, Nathan and I chose rock and Evan had an "unauthorized" entry.  Instead of two fingers for scissors, he had his thumb up and his pointer finger sticking out - like a gun.  Nathan and I looked at each other and then at Evan.  "What's that, Evan?" I asked.  "POW! It's a GUN!"  Yep, guns pretty much take care of rocks!  Who's the RPS Master now?