Between a trainer's challenge closing and the battle screen the
transition runs 219 frames with every joypad and script bit clear, so
the scene read overworld and a pad was dealt: a walk toward the leader
pressed into the animation, gave up after three refused steps and put
him in the blocked ledger, and the trainer's conversation read as over.
wCurOpponent is set when a battle is decided and cleared by EndOfBattle
with wIsInBattle. It is not in the generated table; it is the byte
between wIsInBattle's flag byte and wBattleType, both neighbours
checked against the table, and controllable() reads it.
