Because the video is still unavailable, I'd better elaborate.

This event has just finished. A video of it was streamed live on the official Rocket Lab channel on You Tube.

At the end, they did a ribbon cutting ceremony involving a demonstration of the water deluge system. From the video it looked like the whole posse was about to get completely wiped out! You're left wondering whether it went a little bit wrong, but I'm pretty sure it was mostly/entirely a deliberate fun little stunt by Rocket Lab.