Forum:Straight flush negation?

So question, lets say I'm battling someone and I used up all my spell&trap card zone. My opponent uses straight flush. Now if I use seven tools of the bandit after he/she uses straight flush, would it actually be legal to be negated or is it too late because of the fact he or she already activated straight flush?

76.4.97.11 (talk) 00:04, February 15, 2013 (UTC)