I know you're being all humorous and ironical and all, but in the interests of accuracy there were at least three Fox News employees who witnessed the event:
Gianforte grabbed Jacobs by the neck with both hands and slammed him into the ground behind him. Faith, Keith and I watched in disbelief as Gianforte then began punching the reporter. As Gianforte moved on top of Jacobs, he began yelling something to the effect of, "I'm sick and tired of this!"
Jacobs scrambled to his knees and said something about his glasses being broken. He asked Faith, Keith and myself for our names. In shock, we did not answer. Jacobs then said he wanted the police called and went to leave. Gianforte looked at the three of us and repeatedly apologized. At that point, I told him and Scanlon, who was now present, that we needed a moment. The men then left.
I'm not sure whether any of Gianforte's campaign staff were also in the room. Other people were present just outside the door, e.g. in this quote from another reporter nearby:
Alexis Levinson, a reporter for BuzzFeed News who was present at the time, has confirmed much of Jacobs’s account. Although Levinson tweeted that she didn’t witness the entire incident, she described how it looked from behind “half a closed door.” From Levinson’s point of view, “Ben walked into a room where a local [TV] crew was set up for an interview with Gianforte. All of a sudden I heard a giant crash and saw Ben’s feet fly in the air as he hit the floor.”