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a.) That is MJB's trick.b.) It wasn't an errata, it was a clarification (or so I've been told).c.) This opens the door for way cooler things.
Angry Mob's special ability is "Discard a random hero from a random territory." The stuff actually written on the card is only the "how," and the "flip 'em back over" has been an obvious understood step for years. Consider Angry Mob's text as part of the same category as the second sentence of the Pale Green Prince of This World. It is not a special ability. It was just supposed to clarify what that ability does or how that ability works.
I'm confused by the last two sentences of your post.
Select a territory at random by spinning Angry Mob and arguing about the significance of its final position. Discard a random hero from that territory.
Angry Mob was printed in 2001? in the Apostles. That was the same set that had Nero, which has the lame second sentence that the pale green Prince of this World had. That second sentence isn't a special ability. It is a "clarification." It is the same with Angry Mob. Turning the heroes face down is not the special ability. Discarding the heroes is the special ability. The face down part is just a long, incomplete way to say "discard a random hero from that territory."
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