Guy parked it at the entry to turn 4 at the Streets of Willow. I rear-ended him, and as I fell down along the left side of his bike my left arm got caught between his tire and undertail. Dragged me along on my back for a few yards, my arm ripped off his hugger and exhaust can. He continued on into the pits. My bike flipped and landed on my left foot. No injuries except for some mild soreness all over the next day.care to elaborate on how you ended up in that situation ? !!