[maximusPrime]

You need to work out how fast you can select your unit, hit B and then click behind your line first. If you have slow reaction times you must select the stalker earlier than someone who has a very fast reaction time. You see the Pros select a single stalker when it's health is well into the red but that's because they click like crazy. I myself will look for the stalkers who have their HP at around about 3/4 or 1/2 and then blink them back, by the time I've actually selected them, hit B and clicked behind the firing line they will be at about 1/4 HP or so.

Originally Posted by cruxis

I also notice a lot of people just do groups of 2-4 to blink back.

I think people usually do this when their army might be out of position or on the move before you get the desired arc around an army. Blinking units in the middle backwards allows the rest of your army to spread out and around easier i find from my own experience.