How to not telegraph.
In a fight situation, if someone tries to kick your knee you may pull your lead leg back, but this can present the head as a new target for a hand strike, like wise, if you defend against a strike to the head by pulling your head back, there is every chance that you will present your front leg as a new target for a lick.
Therefore when we train Biu Mar (Arrow stepping) it is important to get used to keeping the body upright and to not telegraph your intentions, this also applies when using this footwork in Pak Sau drills or Sarm Bok Mar drills.
When stepping backwards there is a tendency to want to rock the boys forward first before transferring the weight. This is prevented by simply lifting the back foot, and when you begin to fall push from the front foot.