What would you do if there was an alien in your room and you had no choice but to kill it what would you say to the alien before it blew up ?

Hi quick question. If you were in a room with an alien and you had no choice but to make the alien blow up and you were watching the alien cry In pain what would you say to the alien before it blew up to death? The alien would probably be like Noooooooooo so like what would you say to the alien just before it blew up?