I remember that day well and you are spot on, no other word could describe that atmosphere better than "evil."
Cozzers everywhere, meat wagons parked all along the centre of the high road. After the match there were thousands waiting along the sides of the high road, cozzers or not, just waiting for the goons to be escorted out, after being held back for ages, just to kick off with them.
In all the years I've been going to WHL, since 1977, I've never experienced such a nasty atmosphere as that game, before, during and after. It was genuinely scary because you could literally feel the hate.