Since we've always defined Shatter Spirit as, "an Obliterate that only takes one death", I would say it also counts as "Unavoidable" in the same way.Sacrifice will not allow you to take the place of a Character which has died due to a Players decision to avoid a Ritual Effect or as a result of any Ritual effect which is defined as "Unavoidable" such as Obliteration.
elliotbay said:Since we've always defined Shatter Spirit as, "an Obliterate that only takes one death", I would say it also counts as "Unavoidable" in the same way.