Forum:Trap Stun/Magic Cylinder

I have a strong feeling this is in an obscure ruling somewhere, but...

Player A has a Set Magic Cylinder. Player B has a Stardust Dragon in Attack Position and a Set Trap Stun. It is Player B's Battle Phase. Stardust Dragon attacks and player B immediately activates Trap Stun. Does Player A have the option of chaining Magic Cylinder to Trap Stun? Or does Player A have to activate Magic Cylinder directly in response to Stardust Dragon's attack (if Trap Stun wasn't activated)? --UltimateKuriboh (talk • contribs) 00:44, September 12, 2010 (UTC)