Initially it was reported that the explosion occurred due to the fact that the mine was stuck in the barrel of the self-propelled gun. However, the frames show how about a second after the start of the video in 2C4 "Tulip" arrives ammunition, released by another calculation.
The video was posted on the AhtubaTV YouTube channel:
The footage shows a soldier, probably seeing that a mine is flying towards him, trying to run away from the self-propelled gun. Although it is quite possible that he simply hastily backed off before firing from the Tulip.
The condition of the wounded is not reported. It is known that the incident at the exercise in the Republic of North Ossetia-Alania occurred more 12 April. But in the media, the information got only today.