Returning, twist fate, and instant kill spells

[Amhazair]

When a unit under effect of the 'ritual of returning' spell is wounded, it will immediately return to the home province. Somehow, I have allways assumed this meant that if it was killed instantly - wether by an instant kill spell like soulslay, or just by a single attack big enough to kill in one blow - the spell would not help you out, and you would still die. (Or, in other words, the first wounding attack would affect the unit, before he teleported back) I can't remember ever having this assumption put to the test though. Can anyone confirm that my assumption was correct?

Then, the twist fate spell says 'the first succesful strike against the caster is negated' Is this taken into account before ritual of returning? (Meaning a unit with affected by both twist fate and ritual of returning will need to be hit/wounded twice before teleporting away?)