Having watched it through it seems that
- Schneeeule made a long queue around 1:30, possibly by mistake, and relatively quickly undid it
- Firepluk made a long queue around 6:00 (apparently to test) and then undid it
(Attaching timestamps to your report, and making an actual report, makes it far more likely that an admin will pursue it.)
Unless there are reports of additional incidents forthcoming, advising people not to abuse this in future seems like the appropriate action in this case.