Noticed while testing the look-at-self feedback for traps. When
punished and the iron ball gets buried, hero becomes "tethered to a
buried object". It is possible to simply walk away (like from a pit,
bear trap, web, stuck in floor by solidified lava or sinking into
molten lava) but that requires many tries. Once the escape happens,
"you finally wrench the ball free" and are supposed to have it
reattached to a replacement chain. However, buried_ball() wouldn't
look at buried objects if the trap countdown timer was 0 (which is
the case when finally wrenching free). So hero got a new chain to
drag around but it had no heavy iron ball attached.
I didn't turn on sanity checking but that would have complained about
this. Normal dragging didn't care but I wouldn't be surprised if
various actions that checked Punished and picked up the ball in order
to put it down again elsewhere would have had possibly serious trouble.
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