Forum:Questions About Reactors

Few questions about reactors, 1)Player A already has [Seed Cannon],and during his turn he activates the card's effect by sending Seed Cannon into the graveyard. Player B has Magic Reactor on the field,can he uses the effect of Magic Reactor to destroy the Seed Canon?  If so,does Player B still take damage from Seed Cannon

2)Player A already have Skill Drain on the field, Player B summons [Trap Reactor],does Trap Reactor still can activates its effect to destroy Skill Drain?