What exactly happens in this case? With both sides of initiative?
Bossk vs Xizor ability
Initiative does not matter. Bossk happens first, since it triggers before dealing damage. Xizor's ability happens in the dealing damage step.
What exactly happens in this case? With both sides of initiative?
Refer to the FAQ:
Bossk
When a ship is hit by Bossk’s attack, Bossk may cancel a <crit> result to add 2 <hit> results before Draw Their Fire or Xizor’s ability can be used.