Cosmic Encounter - PBP: Deep Space Water

YinYang is currently in possession of the Reactor Flare, so yeah while Laser probably doesn't want to help out here, it's to prevent a YinYang victory instead of a Reactor one.

I think you actually could've safely invited everyone on this invasion since the Reactor and Laser wouldn't gain any new colonies, the Super Reactor wouldn't go off, and it'd be a stronger force to prevent a successful YinYang defense/victory.