Forum:Trap Card Query

Question. What if, example. My opponent activates Psychic Tuning, reviving Psychic Lifetrancer. And his life points are below 2000, mine's are 800. Then i declared an attack to one of his face-down monsters. Then it is destroyed, but my opponent activates Telepathic power, and i chained remote revenge. when i activate remote revenge and targeted Psychic Lifetrancer, psychic tuning is destroyed, and when psychic tuning is destroyed, the opponent's life points will decrease by the level of lifetrancer's. My question, is Psychic Tuning's effect activates when it is destroyed or after telepathic power has been resolved?