Forum:Supervise and the like negation

If I have a spell in play like Supervise, my gemini monster is destroyed and Supervise activates, can my opponent negate it then, when the card's second effect activates or can you only negate it only when it is put in activation? Also I think that similar cards such as continous spells/traps must be negated the same way. I know that they must be negated when activated, only I've had a quarrel about this recently so i'm asking to be on sure... and to have proof next time of course :DTunyo93 (talk • contribs) 19:23, June 24, 2011 (UTC)