In the script ai_fantasycreature_taurus.lua comment out these lines:
if string.find(string.lower(g_Entity[e]['limbhit']), "head") ~= nil then
SetEntityHealth(e,0)
ResetLimbHit(e)
end
(lines 152-155 in my copy of the script)
Now set strength to 3000 or whatever and try to kill it.
Been there, done that, got all the T-Shirts!