You went to the basement of the lab, and it was full of atomic nitros. 'Here is where we store all nuclear things' you thought. Nitros can kill you. You want to go outside of the warehouse, but the guard don't let you pass. 'We are from the Enemy Planet, and we want the planet Earth like our colony.
So that is why we attack the humans. You now know our secret and the goal, but i think that you will not survive.'