Nothing wrong with coming up from below but for me personally I find up from below to cause more collisions, is a harder shot, and it takes longer to set up which gives comrades more time to warn the victim. Also, I'm usually bouncing more than one so I have an alternate target or two in mind if my first choice starts agressive evasives. Even then, if the guy hasn't started a dodge by 2.0, it's probably too late. Against numbers, getting below a guy and voluntarily surrendering E by chopping the throttle seems unwise. YMMV