Actually it's not. It's 89775.
http://www.wowhead.com/spell=89775
http://worldoflogs.com/reports/rt-0z...?s=1008&e=1163
Notice how they both share the spell name "Hemorrhage". EventHorizon is just broken in this regard.
Edit: More evidence towards it being spellID 89775 is that effect cell in the data table on the Wowhead pages show that 89775 is a bleed debuff, while 56807 shows a server side script. What this means is that spell 56807 runs whenever Hemorrhage lands, it takes the damage done and calculates how hard the 89775 is supposed to hit for, then it spawns that bleed debuff and overwrites any already existing.