Thank you guys four the helpful replies!
They nailed it: clutch + brake + same throttle position = high revs. same thing would happen without a throttle lock, but with any throttle lock it revs a little higher unless you have a decent grip in the throttle (which you probably will in a panic stop)
Best practice is to chop throttle as you are reaching for the brake lever. This can be easily done in a nice smooth motion with experience on your side. I dramatized the chop throttle in the video to make it easier to see. I probably should have added a smooth roll off as I an reaching for the brake too.
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