But it was a chance action, without intention or wish to murder.

No man, even if he were a fool, would choose such a place or such a means for murder." "That's true; but how does it help to call it accident?
Accident calls for a bow in hand, an arrow within reach, an impulse to try one's skill at a fancied target.

Now the arrow--whatever may be said of the bow--was not within the reach of anyone standing in this gallery.

The arrow came from the wall at the base of which this young woman died.

It had to be brought from there here.