From memory I think Koschitzke once ran into an umpire in the VFL around 2006.
He was in the contesting a ball up, and the umpire backed straight into him.
He never took his eyes of the ball and could not know the umpire would back that way but still got reported and suspended for a week.
Was also an issue for him considering as he was starting to make a return after his fractured skull and from what I can remember a set back in his rehab
Generally AFL umpires a pretty good, they will always extend an arm behind them to clear any players and show their direction and when there is contact they will try to avoid penalties - VFL tends to take a more hard line approach...