I had an untapped Starport Security in play and had enough mana up to use it's ability. My opponent targeted it with Tragic Trajectory and the game did not ask me if I wanted to let it resolve and never gave me an opportunity to respond. I should have been able to use my Starport Security to tap one of their creatures before letting the Tragic Trajectory resolve, but the game just pushed it through and destroyed my Starport Security without giving me the chance to respond.