TBD
Complex Actions can be Interrupted by spending a Quick Action.
The Quick Action occurs before the Complex Action. If the interrupted character becomes Dazed as a result or otherwise unable to normally perform Complex Actions, the Complex Action is cancelled. Receiving 0 Damage is not enough to cancel the Action, but it does break Concentration.
Quick Actions used for Interruption don't come with a Free Action.
The Interruption must be declared after the move or action has been declared, but before it is resolved. Ample opportunity to do so must be given.
Multiple characters may interrupt the same Complex Action, but all interruptions must be declared before any Quick Action is resolved. The Quick Actions all occur before the Complex Action, in order of announcement. This is an exception to the rule that during the Missile Phase, Sides take turns using Actions.
TBD
A character who declares an Evasive Stance gains Missile Evasion against any attacks from the Front and Side until his next Complex Action, or until Dazed, Engaged, or being otherwise distracted and doing something else.