what your trying to afford with a rat shot load just isnt in the budget.
the time between contact and your second shot (because your first was useless) just gave your adversary time to show you how its done properly with two where your vital organs used to be.
warning shots, spoilers, and anything making an attempt to "soften" rather than flatten a target are just a waste of ammo capacity that you might need, particularly if he brought friends, which is often the case lately

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it just needs more voltage