It’s not harmless when someone jumps on a wheel like. I had someone I didn’t know jump on my wheel during a recreational event—he followed too close and touched wheels. He and his bike went down abruptly, with his handlebar going into the spokes of my rear wheel, locking it up and causing a loud blowout. I managed to stay upright, but my rear tire had a 2-inch long hole where it was in contact with the road during the skid. Even though he was the one who fell, he dusted himself off and rode off. I stood by the roadside for 20-30 begging for anyone carrying a foldable spare to sell it to me. Obviously could have been worse if there was traffic close by and he or I fell in that direction.
