WI: Edwardian European monarch accidentally kills another while hunting

In the early 1900s, when family ties among European monarchs were even closer than today, it was not unusual for what were in effect family members to go on hunting trips together - IIRC George V took his cousin Nicholas II in the early 1910s. What if, during some such trip, one monarch ended up accidentally shooting another? Would it start a war?

The George and Nicholas situation might be notable as it probably wouldn't lead to war between the two allied countries but would greatly hurt the united front against Wilhelmine Germany.
 
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