I don't think Matt ever actually stated why his arm was broken, but I felt he couldn't say that because his ego and self respect (?) were also "broken," And he also was not the type of person who could face many of his own realities.
Over all I enjoyed the play very much. I thought the performances and the direction were excellent. And for a "first-time-out" playwright, I was impressed and thought it made for a worthwhile theatrical experience.
"We have enough youth -- How about a Fountain of Smart?"
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"I'm not young enough to know everything." - Oscar Wilde