"....while Cotton emerged with the Snitch, his lap of honour was brutally curtailed as McBride turned his head into a cabbage."
-- match report in the Daily Prophet (DP3)
A collision occurred during the race for the Snitch, between Dougal McBride (Pride of Portree) and Gregory Cotton (Appleby Arrows). This led to illegal use of wands and jinxes by the two Seekers on each other.
As Seeker Cotton's head was turned into a cabbage during his victory lap of honour, it must have been difficult to fly or control his broom....
Although the date printed on the third Daily Prophet Newsletter (DP3) is 1 June 1999, the timeframe for this event is 1992-1993.
From the Web
Writing by J K Rowling on Pottermore: The Daily Prophet