ignorance full every non-longnight day was a longday, how could the Angel of Death get summoned ? I think Allanon may have been referring to the fact that evil people can put an avalonwide curse upon good aligned folk (and their own kind too!), while
good aligned folk have no alternative to balance the equation.
About the only part I find vaguely amusing is that it just goes to show how selfish the ritual is considering it actually hinders people from ALL cities, not just those 'good' aligned.
Written by my hand on the 18th of Springflower, in the year 1086.