Pull Down

How can you pull a fire alarm handle a fire?
In a fire alarm, said down. Do you pull the handle or bottom line can be pulled down? When you pull the handle is removed slowly or quickly? Why is it that some people take to the slowest pace in compared with others? The arrows on the handle down means that you pull the lever down, without pulling out and down? How to tell someone to pull the lever down, why the instructions say not to pull the lever and down? Why are there arrows How to help someone pulling down?
Simply secure man. I understand.