Hundreds of rounds?
If you watched the video, note you won’t see many, if any muzzle flashes. Even the flashbangs are muted. However you can see snow kicked up by impacting rounds on the truck near the roofline and at the point where the show is up the side of the pickup. There are only a few of those, but it is likely that steady fire from multiple weapons was maintained for a while.
I think she meant that hundreds of rounds were used during the entire confrontation.