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B919: Cauldron bubbles: turn hostile
Used by the routine at upd_160_to_163.
Setting bit 2 of the type turns 160-163 into 164-167, and clearing bit 1 of +7 makes them solid, so they can now touch the player.
bubbles_turn_hostile B919 SET 2,(IX+$00) types 164-167; solid
B91D RES 1,(IX+$07)
B921 JR bubbles_draw draw
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