before the arrival of the moon at the point aimed at
Sheldon aimed at
the centre of his chest, then deliberately shifted the aim to his right shoulder, and, with the thought, "That will put him out of business," pulled the trigger.
The bullet struck so low down that probably his antagonist would never have aimed at
that part of him--people never do; he would have aimed at
his chest or head; so that probably the bullet hit him accidentally.