"What had been a Quidditch match turned swiftly into a human versus tree battle, which the wizards won only after seven hours’ hard fighting. Nenad was not prosecuted as he had been killed early on by a particularly violent spruce." (Pm)
The match between Romania and New Spain (now Mexico) ended in a massive attack by the forest near to the stadium on the edge of the West Siberian Plain which injured many and killed several. The forest had been bewitched by local Dark Wizards in the pay of one Niko Nenad, a hot-headed player who was known for violent outbursts, including attempts to strangle referees. The battle lasted for seven hours (Pm).
"Attack of the Killer xxxx" as a film or programme title can sometimes be used as a funny or stereotypical reference (TV Tropes), however this event in the wizarding world was both deadly and serious.
From the Web
Writing by J.K. Rowling on Pottermore:
- History of the Quidditch World Cup
- 2014 Quidditch World Cup reports
- 2014 Quidditch World Cup final
- The Daily Prophet
Pottermore enhanced reading experience: Quidditch World Cup
Screenshots of the original Daily Prophet coverage of the 2014 Quidditch World Cup on Pottermore: http://imgur.com/a/AXutv
Harry Potter Wiki: Attack of the Killer Forest