To clarify, it's my current understanding of Mystic Empowerment that:
1. When used on a rapid fire or ricochet attack, only one of those attacks will receive the leaderships effect.
2. When used on a beam attack or area attack, only one of attacks in that series will receive the leaderships effect. (IE one of three models caught under the tool instead of all three.)
3. The leadership can be used on a character making a retaliatory attack outside their own activation (thread topic).