How do you calm down an adult mouse after it saw two adult rats in the room?

Put it back in it's cage and give it treats, sunflower seeds ect. Make sure it has a nice dark place to hide into. My mouse is terrified of rats, but alas for him, he shares a room with two =3 all u need to do is put it back into the cage, i dont see why you would be showing the mouse the rats because they are the natural enemy of the mouse!