+1 to Lycanthrope's positions.
To make it a little easer, its like stoping your car with your breaks or attaching a steal cable to the bumper of your car and latching the other end to a tree. You get the same job done, stoping the car.
With an analogy like that it's no wonder you just don't get it - new firearms for the most part are safe to dryfire. Check the manual if in doubt.