I'm not familiar with the procedure of giving a warning shot. Are you entirely certain that these shots were fired high up in the air, instead of, say, 5 meter

I'm not familiar with the procedure of giving a warning shot. Are you entirely certain that these shots were fired high up in the air, instead of, say, 5 meters up ahead (or behind, for extra safety) of someone running away, into the ground? Leaving that aside (I might be totally wrong and you can convince me of that): "Last resort" leaves only room for one single thing, right? And I'd put "shoot at a person" in that place, after all (potentially?) dangerous acts of warning.