Forum:Solemn Warning vs Fusion Summon

If I fusion summon using polymerization or dark fusion or any fusion card, does my opponent have to negate the fusion card to prevent the special summon, or can he/she negate the summon of the monster after the monster is summoned? I always say you have to negate the fusion card but no one seems to believe me, so I'm wondering what is the correct way to use solemn warning. Neos01 (talk • contribs) 22:40, September 10, 2011 (UTC)