That's pricely the point. That's why Mister Miracle commented on Batman being efficient. It wasn't a wind up haymaker, nor a round house or upper cut. It's one of those "so fast no one saw the punch while my hands were on my hips and returned to my hips like a gunslinger/ Muhammad Ali phantom punch/super secret bat-jitsu technique" blows. Guy had the wind up and was already starting to swing when he got knocked-the-f-out. He didn't even see it coming.
And it sends a crystal clear message to Guy. "I can take you apart with ease anytime I want to and you couldn't do a thing to stop me."
Someone please tell me Beetle and Booster took pics of him on the floor with timestamps and other silly things you do to your drunk friends who couldn't hold their liquor.