Man, I was watching those people standing pretty much behind some of the MANPADS guys. I'd assume that Russian MANPADS (presumably this is a Verba?) are comparable to the Stinger.

https://www.globalsecurity.org/military/library/policy/army/fm/44-18-1/Ch2.htm

During annual service practice firing, there should be no personnel closer to a firing point than 50 meters (164 feet). Under combat conditions, personnel within 15 meters (50 feet) of the weapon run a high risk of being injured by flying glass and debris. The team chief should be close to the gunner's side to insure that he is not endangered by the weapon's backblast. Allow at least 5 meters (16 feet) safety distance from equipment. Under combat conditions, these safety distances for personnel and equipment may not always be feasible. Damage to radio equipment may result if it is within the backblast area. Always inform the unit that you are supporting of the noise and backblast safety hazards.

Wear ear protectors, helmet, and flack jacket when firing. Personnel within 125 meters (about 400 feet) should also wear ear protectors.