Where Did Markworth Come From?

In the story, A Well Deserved Fan fiction, written by Max Mollish, in the second chapter, Lowry decided to play his tuba at Officer Mollish, Officer Nick, and General Toe. But what he didn't know was that lying deep within the confines of that tuba, was Markworth, who proceeded to be shot out of that tuba and into Lowry's music room. Now everybody is wondering, where did Markworth come from?