Well... I did
Entry, Type, Event, Chance, Maxcount, Spell, Spelltype, Targettype, Cooldown, FloatMisc1, Misc2
14720, 4, 13, 100, 0, 26339, 8, 0, 0, 0, 0
Entry of Saurfang, 4= A Spell, 13=UnitCrit(when he is critted), 100=100% chance to proc when critted, 0 can proc infinite times, 26339=Spell that will be used when critted, 8= It's a damage spell, 0=A null target-The one who crits them?, 0= No cooldown on the proc.
What's the solution? The mob now doesnt even perform fighting, he runs to the target when aggroed and then stands there.
/help x1000