Looks like A missionary for The Church of Jesus Christ of Latter-day Saints fought off a would be be armed robber. Neither him or his companion were hurt.
This Facebook video looks to be surveillance video in Brazil. In the video Two LDS missionaries are seen walking down a sidewalk when two men pull up on a motorcycle and one of the men jump off the motorcycle and confront the missionaries before pulling out a handgun.
One of the missionaries wrestles the gun away from the armed man. The second guy attempted to get the gun back, but the missionary throws the gun over the fence. The missionary and the would be robber then continue to fight. A motorcyclist passing by stops and helps the missionaries before the robbers run away.
According to KSL, Mormon Church officials confirmed the incident took place in Brazil on the Manaus Mission.