Downshifting should never be attempted before knowing the vechile your driving..
Sometimes you can use the gears to pull up hard and step the rear out and have the car in the right Torque area to pull away hard on corners.. Or you can use the gears to pull up even faster if say a car pull in front and leaves you with no where to go..
Before my accident i saved myself this way on the freeway not the place you expect to see a car doing 40kmph in a 100 zone with small if no traffic.. Used my gears to aid my braking and missed hitting the rear of the clown..
But i know my car well enough to know it's limits and speed to achieve the downshifts.. Best thing is to learn that then try it cause last thing you want to do is lock the rear up dropping to many gears at once.
"Just a matter of time i suppose"
"The elevator is broke, So why don't you test it out"
"I'm not trapped in here with all of you, Your all trapped in here with me"