Forum:Mirror Force and Dust Tornado

When I was dueling someone, he activated Mirror Force and in response I activated Dust Tornado which was already set. He said that it was too late and that Mirror Force's effect had already taken place. As I understand it, however, both are Spell Speed 2 cards, and Spell Speed 2 Cards can be used in response to other Spell Speed 2 cards. Can someone explain why then Mirror Force wasn't destroyed. Thanks. 24.210.152.254 (talk) 17:04, June 29, 2010 (UTC)