Vidya would be all the hell over a tournament, even if it means directly cooperating with her creepy, creepy housemates ;D Given her attitude when it comes to house rivalries, she's likely to view it a lot more casually than the others do. More of a chance to show off a bit and do clever things rather than "Rar!!! Gotta beat Gryff!"<br/><br/>Petra would be eager to help, but probably wouldn't do much good as an actual player herself, given her average magical talents and her various weaknesses. Depending on what sort of challenges the students face I see her probably helping her house out with research and puzzle solving and those sort of things, aaaaaaand possibly helping some individuals from other teams behind the scenes (Guztav and Alex seem to be the most likely candidates because of their relationships, but there are plenty other opportunistic types who might see her as useful.)<br/>Since Hufflepuff has fewer students than the other houses she'll at least<em>try</em>and compete, I just doubt she'll excel unless it's in some unexpected way.