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Identify the speaker and the even that is being described. "I can't think of the name of the engine. But it has two pistons. What is that engine? Well anyway, in this engine first one piston sinks, and then the next one sinks. The one holding on to the trunk sank for a second, up and down like a piston, and then the other one sank and fell."
Who is Leper who is describing what he saw when Finny first fell during the mock trial.