Can you use Magic Jammer to negate the effect of a Spell Card that is already on the field?

Question

I was dueling my brother today and he activated the card Magic Jammer to keep the effect of Dimension Fissure from removing my D.D. Survivor from play so I couldn't bring it back at the end of the turn. Is that a legal move??

Answer 1

no, you have to use magic jammer at the time the spell card is played  

Answer 2

No, Magic Jammer can only be activated when a spell card is first played.  

Answer 3

no, magic jammer can only be activated when a aspell card is activted.