Used by the routines at CREATURE_UPDATE, PICK_UP and ANIMATE_AND_MOVE.

Walks the records in use from the last down to the first -- the six fixed ones at FIXED_RECORDS, the room's floor, ceiling and four walls, included -- and stops at the first that overlaps the box, the mover's own record and hidden things aside (TEST_ONE_RECORD). Used for a move (ANIMATE_AND_MOVE), for the place a thing would be dropped (CREATURE_UPDATE), and by the pick-up (PICK_UP), which carries on down the list from NEXT_OBSTACLE (PICK_UP_LOOK_ON) until it finds a thing it can take.

On the way it deals out the strike counters. IY+2 starts at $9E and goes down by one at each fighter (bit 7 of +12), but no lower than $98: the first six fighters from the top of the list have the counters at $9D down to $98 in STRIKES_LEFT, and any more share the last. The count depends only on the order of the records, so a fighter has the same counter for as long as the room lasts, and when a fighter is found IY+2 holds the low byte of its counter, for OBJECTS_MEET.