I once had a girlfriend that got into Thai Chi.. they do all these slow movements, very slow,, But if you ever try to "go at" someone with these skills, they can do them quickly , toss you across the room , break your arm or just trip you up and run away. it mostly a self defensive strategy.
The movements are mostly based upon taking the energy thrown at them and using it to their advantage. grab the punch pull the attacker through to the ground. They do them extremely slowly and it looks like a weird dance but there is reason behind it.. it trains them and their muscles and reflexes, so they can do it faster when needed. Maybe there is some similar theory behind shooting like that in pool? yin yang ! ;-)