1. My enemy activates a unit and initiates am melee combat with a unit from me, is fighting back a Reaction or may I use a Reaction in addition, for example for a ability like "Set for the Charge".
2. If I have models with no enemy models within their range, can I sacrifice their attack for Coordinated Attacks or Coordinated Defense?
3. If a enemy unit initiates combat by charging a unit from me, can I move my models up to their base movement, as described on page 20 "Moving within melee and breaking away" or is that only allowed if a unit whas already in melee before?
"If I understand correctly, if my opponent charges my squad, he can move up to 3x movement to engage my models (any of his models that don't make it into base contact but still have my models in their threat range may make attacks without the CS bonus), but I don't get to move my models to engage back, since these squads weren't already in combat?
And then in the next round, when eithre of us activates their squad in that melee, the piling in up to base Movement does happen?"
You are correct. Sorry for the confusion.