I don't understand emergency paddle switches unless they include a brake feature. By the time you hit switch, and saw winds down, hand, finger, limb (choose one) is severed. 40 tooth blade turning 3000 RPM, means each minute, 120,000 teeth are passing any given point. Three quarter second reaction time means only 1500 teeth have passed, but for most of us 3/4 second is faster than we USED to be.