Viktor Krum and an Unforgivable Curse

[zoehooch]

No: HPFGUIDX 32810

In the last task of the Triwizard Tournament, Krum hits Cedric with 
the Crucitas curse, and, we suspect, Fleur as well. After Harry helps 
Cedric, he says "I can't believe this ... I thought he was alright."

But at the end of the book,as the Durmstrang students are preparing 
to leave, everything is quite happy; Krum says goodbye to Hermione 
and Ron asks for his autograph. 

Why isn't Harry concerned?  How would he let Hermione go off in 
private with a wizard who had performed one of the unforgivable 
curses? Then again, Harry must not have told anyone or surely some 
action would have been taken against Krum.

Is this an oversight by the author?  Any ideas?

Zoe Hooch