When using the stranger vs Leia when trying to kill Jyn if she has the second wind and is already at 1 hp she is not able to be defeated, she is resistant to the instakill of Stanger basic and any damage does not triguer the second wind effect and she cannot die even when raddus is already dead.
In the images joint the first image is before trying to instakill and the second is after having try.
I think to be able to recreate it you need to inflict shock or buff immunity on her, before she lose all her protection make her go to 1hp with Raddus still alive, then a cleanse with no heal, then attack her if she gain the buff and her health never goes above 1 hp she cannot die.
Other option is she gain second wind, you put her to 1 hp ( which should atctivate the second wind) if it does not activate when Raddus dies she is invincible.
Important note: I won the battle when the second wind buff expired then I was able to kill her.
