Hi Pp,
I'm John and I managed the scoring team for NAC. The cameras were used to verify crossfires, and they performed excellently. By matching the timestamps from the cameras at the bench and the target, we can accurately determine if a crossfire occurred.
Crossfires are a common issue, but this year, we only had a few per relay, which is typical. Last year, without the cameras, we had a significant number of instances where people "accidentally" shot at others' targets. It's unfortunate that we need surveillance to ensure fairness, but the cameras will be used going forward to help maintain the integrity of the competition.