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Yep, that makes sense. I think when you're listening to RoboRunner, you might want some higher level data too, like avg score and number of battles. So I think adding a new / similar listener to the RoboRunner class makes more sense than just letting you add more custom instances of the existing BattleResultHandler. The new interface method could take the raw scores and elapsed time, as now, plus whatever other summary data you want. At the end of RoboRunner's BattleResultHandler.processResults(), we call the higher level listener, if it's been set.

Does that sound about right?