Forum:Ancient city rainbow ruins 2 questions

First question is just a clarification on a ruling on its page, when it says you must send a crystal beast monster and not a spell to negate a spell or trap it means only crystal beasts in the monster zone can be sent and not if they are acting as a continuous spell correct?

Second question, if your opponent activates another field card while this one is active can you use the negate a spell or trap effect to negate that field card from being played and save ancient city or is it destroyed before you can use the effect?173.181.82.113 (talk) 00:26, November 17, 2012 (UTC)confused