If a player uses Smoke Screen and the opponent reacts with Discipline (drawing Defy), can the opponent play the drawn Defy to cancel Smoke Screen?

Ruling: Yes, the opponent can use the drawn Defy on Smoke Screen. Players get reaction windows at each chain link as it resolves, not just when the entire chain resolves.

Sequence:

• Player plays Smoke Screen, starting a chain
• Opponent reacts with Discipline (chain is now: Smoke Screen > Discipline)
• Chain begins resolving with Discipline (the last item added)
• Discipline resolves: a unit gets +2 and draws Defy
• Priority passes to players for reactions before the next chain link resolves
• The opponent can now play the drawn Defy to react to Smoke Screen
• If both players pass, Smoke Screen would then resolve

Nuances:

• The chain resolves one link at a time, not all at once
• Players get reaction windows after each individual chain link resolves, before moving to the next link