I believed that the old masters didn't spar with the young black belts because they were afraid of embarrassing or hurting them.
There was a brief period when I first joined Bullshido that I thought Lebell was Judo Gene. Yeah, I can be that dumb, sometimes.
When I was 15 a kempo guy I knew convinced me that you could bounce punches off your body to make them faster.
I think they call it "rebounding".