Forum:Shock master vs field spell??

If my opponent has a Number 16: Shock Master and declare spell with it, and I have a field spell, can I activate de effect of Dragon Ravine or The Gates of Dark World or similar field spell?? if not, I still can paid the cost, like with Darkflare Dragon with it effect negate?? Copperfield (talk • contribs) 21:48, March 21, 2013 (UTC)