I need some more context for this video to accurately report what’s going down, but the video description is blank and comments have been turned off.
Considering we don’t have that necessary information, I’ll make some assumptions based on the countless hours I’ve spent perusing the internet for similar content.
Here’s what most likely happened: A large group of tourists were swimming and hiking around this popular lake when a large bull moose appeared.
Rather than doing what they should, they started making a lot of noise, running around, and trying to take pictures and videos of the moose which probably agitated it and caused it to charge after the tourists.
I’ve embedded the video to start around the 1-minute mark. It’s a little difficult to see the moose charging, but pay attention to the audio. You can hear people screaming and running at the angry bull fends them off.