Conversation so far:
When was the Alf-Inge Haland incedent?
in the 2001 Manchester derby.
What happened during the incident?
a blatant knee-high foul on Alf-Inge Haland.
How did the incident affect his career?
He initially received a three-match suspension and a PS5,000 fine.
Was there a lot of controversy about the incident?
seen by many as an act of revenge.

Question: Why was the action seen as revenge?
Self-contained rewrite: Why was the Alf-Inge Haland incident seen as revenge?