A ROM-gated run from the checkpoint the stream stalled on, gated on its
own variable because the two checkpoint tests beside it assert the map
their envelope is on and one envelope cannot be both.
What it holds: the objective is Pewter City, the road there is on the pad,
BACK is never on a battle pad with no list open, no ball is thrown at a
species the party holds, the fly gets turns, a move or a ball is chosen,
and a battle ends. Which move and which way it walks are the fly's, so
they are reported rather than asserted -- including the forest's north
gate, which this run does not reach.