The Scots rally for a fourth-quarter touchdown and 2-point conversion.
The Capers force five turnovers in a meeting of unbeaten Class C South teams that ends in a soaking rainstorm.
The Trojans win just the second playoff game in program history.
LeGarrette Blount walked away from the Steelers during a game two years ago.
With a roster full of young, often-injured players, South Portland High graduate Brett Brown hasn't won in Philadelphia.