@Kurano
That's how the anime divided it. This chapter had step 2 as preparation of the rockets and step 3 as the decapitation tactic itself.
But to give an example.
Imagine two people fighting in the same place they've been fighting in for years, they know every inch of that land.
Then one day, one of them suddenly retreats into the darkness.
The other guy of course has to follow him, so he does, but he's not used to the new terrain.
So then a friend of the first guy comes out of the darkness and hits him in the head with a sledgehammer, knocking him to the ground, twitching.
Then he whistles and summons the first and several other people and they all kick the hell out of the now unconscious, twitching person on the ground.