"Bloncourt appeared to lose his head at this point, wrestling the Snitch out of his undergarments and holding it up triumphantly...."
-- match report Brazil v Haiti, Daily Prophet, 15 May 2014 (Pm)
A participant in the 2014 Quidditch World Cup, Bloncourt single-handedly wrecked Haiti's chances at the tournament in the first-round match against Brazil. Having accidentally hit the Haitian Seeker Jolicoeur moments before Jolicoeur would have caught the Snitch, Bloncourt then commited a Snitchnip, resulting in Haiti's immediate disqualification from the tournament. After the match, he was reported to be in hiding (Pm).
Mistakes and mis-hit Bludgers
Other canon notes and references
The name Jean-Baptiste is from John the Baptist, a Biblical person. Several famous people from Haiti have borne the same name, including painters Jean-Baptiste Bottex and Jean-Baptiste Jean, and the abolitionist Jean-Baptiste Chavannes.
Bloncourt may come from the Haitian painter and photographer Gérald Bloncourt.
From the Web
Screenshots of the Daily Prophet's coverage of the 2014 Quidditch World Cup: http://imgur.com/a/AXutv