According to a previous link:
14: Kamper, Kaiser, Sidlo, Krzeszinski F 4-2 45-38
So ironically Kamper was in the same fatal races of both Krzeszinski and Dirtl.
It seems pretty obvious to us these days that it was an accident waiting to happen, but perhaps they thought "what are the chances of that happening". They understood the risks before riding, but it seems so tragic that even crudely roping off the area would have stopped man and machines careering under. Lets just hope the poor guy didn't suffer because if you were the nearest, would you have unhesitatingly rushed to help him?