Two pupils fight in the schoolyard of the grammar school in Leichlingen on Wednesday (26 November 2008) (illustration). Photo: Oliver Berg dpa/lnw +++(c) dpa - Report+++ | Use worldwideBullying5 minMrs Schläpfer, do you always have to get involved in bullying?Bullying expert Christelle Schläpfer on bullying prevention in schools and what teachers should never do.