Answer:
Simple story: You're on a ship in an alien city (city = buildings, streets). Your job is to take some kind of weapon that you found hidden inside one particular room at this secret location where nobody else knows it's there - but only for 15 minutes because otherwise they'll kill all human life from planet Earth just so they can get their hands dirty with something which isn't safe even when someone finds out about them. Do as much damage or destruction (in whatever way) to what is necessary until either 1 hour has passed or somebody spots you doing stuff; then simply flee into another part of town, hopefully without getting caught while trying to go back towards wherever was supposed to be left behind...or did I miss anything? That said, you might end-up making a mistake like accidentally killing too many people or destroying enough property etc.
