Then refer to it as video 1 (videos 1 and 2 were taken at the same time from the same place by two friends right next to each other).
It is not necessary to prove they were acting. It can be shown that the UFO in the video is faked. This alone proves the people reacting to it are acting.
However, as my analysis in this thread hasn't really included much about the first two videos (because other people in other places on the web were already on it), I haven't made much a case for anything in connection with them here.
I first got involved when video 3 came out and I found the background photo on Wikimedia, this video has sound bite clips from various people added to it from various sources, who may or may not have been acting when they were recorded, but those sound clips could have come from anything from a fireworks display to the opening of a new Pizza shop ("we see a lot of them in Mississippi, but not like that").