You were both in a ambush, so you just kept fighting them off. He was a little surprised for your age (be any age, but please be a little older around his age so if you both fall in love he's not a pedo-)

When you were both done he was shocked "God, how old are you again?!" He chuckled and looked at all the body's on the floor. That were from you. Ellie on the other hand was COMPLETELY shocked and just stared "what the hell?! You did THAT?!" she said surprised.