You can notice, if you attack it wont hit them from a distance. When an
enemy is in sight hold R, and then B. Dodge his attacks, if you get hit
you will need to start again. Don't let go of R and in a good distance
let go of B and it will go farther. With some guys you will need to do
this twice. Flying guys will appear later in the game. You might miss a
few times (because they can dodge your attacks) try again. Its not that
hard, I've done it all the times.