Beast!
He doesn't look big enough to be that strong?
In most cases, strength is not really related to the SIZE of a muscle. When you train to make your muscles grow, you may become stronger...IE Ronnie Coleman or any bodybuilder. When you train for strength, you do not necessarily need to make your muscles bigger if you so choose. Bigger muscles are the result of getting stronger, but strength training is different. It focuses on tendons, joints, certain lifts, etc. That guy could care less how big his legs are compared to Ronnie Coleman. He only cares how much he can squat...two very different philosophies.