As sometimes happens, in the event that a family member is accidentally targeted as an intruder, firing that blank round will cause little or no harm.
Criminal negligence. "Know your target and what's beyond it." If you haven't positively identified an intruder as such, you shouldn't be squeezing off rounds.
Not a blacksmith could be found in the whole land of Israel, because the Philistines had said, "Otherwise the Hebrews will make swords or spears!"
1 Samuel 13:19