There probably is no video evidence of the post-game shenanigans from 1984. I don't think the game itself was televised.
But anyone who stuck around to witness it probably remembers. In an effort to break things up (police presence was seriously overmatched) they turned on the sprinkler system and played "The Star Spangled Banner."
Triggering effect was UVa fans making a bid to bring down the goal posts (just like Tech fans had done at Scott Stadium the year before). They didn't get either one. First attempt was at the south end zone, but that was blocked by quick reacting students/fans. The Hoo faithful then turned their attention to the north end zone. As a throng ran the length of the field, the first line of defense was the VT cheerleaders along with the Hokie Bird mascot. As the UVa fans arrived on that end, the Hokie Bird (pretty much blindly, I would assume) just started throwing punches. Quite a few of those connected and absolutely cold cocked some people.
Like I said, not a really proud moment for either side. But still makes me laugh to think about it.