Must have missed that one. or start a new chain of events.
With the wording and the other rules it read like a reroll. It takes you to the last test you failed. Actually it does not. It takes you before that. Far enough, to actually chose a different path, or chain of events. It has to. If that chain C would follow after the test, you need not talk about a chain at all. Or was that fluff like, live another day.
You decide D your path, following is the chain 1 you do not have to test (at least not for your death), till the the critical test X, that you fail and die.
I understood it like coming "to the test" again. Placing the return R right in front of X, maybe even forcing you to repeat X. But your return has to be before D, otherwise you could not chose to do a different chain or repeat your mistake and try to reroll. 2 would be the new chain of events.
D111111X D111111RXCCC RD-1-or-2-or-?
If I understand this now correctly, you might want to change the wording to something like :
"Lucky you for having the power to return
from the dead. Remember that it takes you to the last decision that invevitable lead to your assassination. You can choose to decide differently, starting a new chain of events, or try again, taking advantage of your new acquired knowledge."
Oh, and this sentence might explain my confusion:
You return seconds before your death and can try to change your destiny – going back in time takes you to your last test.
If I take that literally, that is like being struck from behind and ducking, failing, returning, only to maybe run instead of duck (or reroll the ducking). No need to talk about destiny or chain of events. But if you were to return to the moment you decided to search that broom closet, you could change your destiny.
(Oh, and the bonus from fortidudes cleared up. It is 1. Scratch that nitpick)