You must be careful jabbing in the direction of the opponent’s right hand. However, if he is a hooker or chases punches with his rear guarding hand [like a martial artist], flick the blind jab at him and then throw the power jab. If he commits his rear hand to blocking the jab in front of his chin, then feint with that jab and then do an oblique diagonal lunge over his extending hand.
Note: do not do this with a southpaw as you could ruin your ankle.
You are stepping 45 degrees across his front as your punch comes over his guarding hand, so you are losing some power. This may also be used against a slow right hand lead, a right hand lead to the body, or against a right uppercut. These punches are read by noting his preparatory shoulder movement, if any.
This punch should be turned over and aimed at the eye-nose.
This is an excellent setup for the straight right followed by a hook as you get him into your wheelhouse immediately.
You must be careful to land on the heel to avoid ankle injury. Don’t try and land and pivot all at once as it is too dangerous to the foot and has a low probability of being synchronized in a fight. Save pivoting for the next punch.
For self defense turn southpaw and do this as a finger jab, raking into the eye socket from the side with three coned and slightly bent fingers. The additional range granted by the fingertip strike will allow you to avoid stepping on his foot and twisting your ankle. It also keeps you away from his knife, which he has a roughly 25% chance of having.