Yeah I just read that too, thats sucks, they're going to have to work around some new angles ans shit now.
This is what i found.
BREAKING NEWS: HHH Injured and Possibly Out For A Long-Period of Time
Reported by: Nick Evanish of Top-Rope.com on May 22, 2001
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Dave Meltzer believes that there appears to be a 75% tear to his knee tendon, and while HHH will be having an MRI to determine the full extent of the injury, the prognosis does not look good.
The injury occurred at the end of the match when he was thrown over the top rope and all of his weight landed on his knee. He was able to complete the finish of hitting Austin with the sledgehammer, but then apparently collapsed to the mat in pain.
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The following is an email from a fan...
I was at RAW, and at the end of the Benoit/Jericho vs. HHH/Austin match, HHH apparently hurt his knee, as after the match some EMT's went down to the ring to see if HHH was alright and he was eventually helped to the back. But what most people couldn't see (which I could because I was at an angle in the arena that I could see somewhat backstage), is that HHH was on a stretcher, and Austin and Benoit were around him talking to him and HHH looked like he really was hurt bad.
[Sources are fan's email and WrestlingObserver.com]