http://www.nhl.com/news/2006/04/269868.html
"With the Rangers trailing by four goals and virtually no chance of coming back late in the third period Saturday, Jagr was sent out by coach Tom Renney to get what he called 'practice' in penalty killing. Jagr tried to hit Gomez, New Jersey's second leading scorer, and lunged toward him."
Maybe this is a long shot but, maybe Renney had Jagr go out there to hurt one of the Devils' major playmakers? From that quote above I think that NHL.com is implying that with the quoted practice and the way they worded it thats the case.