Something to consider, about being comfortable and loose in the ring. You get to a point where your jab is just natural to you, like a snake flicking it's tongue. When you throw the 'jab' you know, without thinking, if you are just popping it out there, or putting some shoulder into it, or bringing it up from your hip as you push off your right foot, which is a very punishing blow.
You can do that because you are so at ease in the ring that another professional throwing punches at you doesn't matter because you know distance; that means that you don't even pay attention, much less react, to most of the gloves flying around the ring. When you do, you move just a hair and pop that jab. Your punch lands, his misses and most don't even notice.
There is a point where, no matter what one punch, no matter how fast a guy may be, everybody leaves themselves open. My friend was taught this by Emile Griffith and it is true; you can see it watching yourself in the mirror. No matter how little you telegraph your punches, there is that spot, always. when you are really loose and insanely confident is your ability not to get hit, and your ability to take it if you do, it gets really easy to just reach out and touch those openings.