This pattern is another one of the basics of lots of other casino style patterns. Sometimes it's done with something called 'the tap'. Some people do it with the tap and others don't. Actually, it's probably safe to say that doing 'the tap' isn't easy for most dancers to grasp. It took me a while and I do think it's worthwhile to take the trouble to learn to do 'the tap'. It give the pattern a little more 'sassyness'.
I'm initially putting two videos here. The first is from SalsaJunkies and the second is from some entity in Italy called "Salsa Fuente". I don't know anything about this Salsa Fuente guy (couple)but his videos on YouTube are excellent. The guy is always 'spot on' the beat and I like the way he doen't act like a total 'spasmatic' when he dances (like one other guy does). He's very concise in his execution. I'll be adding more of his videos later.