I would assume a gun of any sort would have been mentioned in the news story that came with it. The only other thing I can imagine would be the driver trying to run over a officer. That would justify the use of deadly force. We don't know that. An officer jumping on the hood or putting himself (on purpose) in the path of the vehicle only forces the end shown on the tape. Not knowing all the details we can't know but given what we can see and read in the story it seems over the top. Only the jury will actually decide on the outcome.