Cool, a heartbreaker but a great game experience. The Canes' fan legends about Sabre fan behavior at that series have grown over the years, but it wasn't that bad. Loud, lots of beer, chanting, cursing, etc. - in other words, not much different than behavior at your typical Sabres-Leafs regular season game - but incidents of actual fighting, ejections, etc. were few and far between.
From talking to a couple of Canes' season ticket holders the last time I was there, Buffalo is still number one on the "pain in the ### fans/sell your tickets for that game" list, but apparently Pittsburgh fans aren't that far behind based on their turnout and actions at regular season games, and I've heard some dislike for Toronto fans based on that one playoff series about a decade ago . . . so it sounds like they just don't like loud and overly passionate opposing fans.