As a Leeds fan i have sat in roughly the same area behind the posts in the same end for the last 4 of our wins.The three against Saints i don't recall any kind of bother at all and the atmosphere was friendly and decent just as you would imagine in your 'Home' end.
However, last year there did seem to be pockets of trouble all throughout our end, some right near where i was sitting, just as i was taking my seat before KO. between a few of Wire and Wigan fans i believe who had obviously bought tickets prematurely! i also recall a few more scuffles breaking out during the play.
Its not nice and shouldn't happen at any game.People who go to sit in the opposite end to wind up and cause trouble are sad people and not needed in our sport IMO.Should both our clubs manage to contest the final again this year lets hope for a much friendlier atmosphere