unusual feint by Rigondeaux

[hma123]

If anyone is a fan of guillermo rigondeaux then you should have noticed this before because he does this in all of his fights and I really dont know why? Some commentators even commented on this but no real insight on it. Its not like a typical feint, he throws a half way punch of some sort (a lot with his straight left) almost in slow motion/half speed...sometimes he comes off with something right after and sometimes not.
A perfect quick example would be right here at around 3:15


Would this be good to start doing? What are the pros and cons of this? As myself a southpaw, I have a few fights (no begginer) I was looking to add this to my game but first I need to know why he does this