Quote:

A 15 MPH panic stop is way different than a 50MPH panic stop.

Yup, and if you think the straight-line stop requires concentration, try one in a curve. I assure you that you do not want to clamp hard on the rear brake in a curve or you will lowside almost immediately. And you will not always have the luxury of time to get out of your lean angle before braking. Like others have mentioned, your front brake should always take most of the speed off your bike.