The state news agency RIA Novosti on Monday cited police in the city of Rostov-on-Don as saying the argument took place in a small store and deteriorated into a fistfight. One participant pulled out a small nonlethal pistol and fired repeatedly.
The victim was hospitalized with injuries that were not life-threatening. The weapon fired plastic bullets or blanks. Neither person was identified.
It was not clear which of Kant's ideas may have triggered the violence.
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