Conversation so far:
What are the brisbane bears in relation to Robert Walls?
Robert Walls coached the Brisbane Bears from 1991–1995.
Are there any other interesting aspects about this Robert Walls article aside from Walls who coached the Brisbane Bears from 1991–1995?
the Brisbane Bears players donned boxing gloves and beat 21-year-old teammate Shane Strempel repetitively in the head

Question: What was the cause of that?
Self-contained rewrite: What was the cause of the players beating 21-year-old teammate Shane Strempel repetitively in the head?