For my taste, Winkmann could have even chosen the straight red card; Perl's decision is certainly the correct one, that deserves acknowledgement. However, it is hard for players who have relied on the assistant referee's flag to accept this decision. The rule is clear: the play stops as soon as the referee has whistled - and not has raised the flag.
Of course, it was a heavy mistake by the assistant referee 2; he probably could not see which player touched the return pass, whether it was a Freiburg or Dortmund player.
I claim more responsibility for assistant referees, i.e., that a raised flag is equal to a referee's whistle. If this does not happen, such situations will always appear every now and then.
The full teams were:
Bayern München 3-0 1. FC Köln
Referee: Guido Winkmann (Kerken)
Assistant Referees: Dirk Margenberg, Detlef Scheppe
4th Official: Thorsten Schriever
SC Freiburg 1-4 Borussia Dortmund
Referee: Günter Perl (München)
Assistant Referees: Guido Kleve, Michael Emmer
4th Official: Robert Hartmann
What do you think of these situations?