Isn't there kind of precedent? When Nael/Eula recovers her mind right before her final death? And Louisoix does the same, only having enough energy to manifest and show his grandchildren (and us) the Truth of the Calamity (and sorta bathing us in Phoenix aether even though the twins decide not to use it to prevent Phoenix from being resummoned, SMN mains everywhere look at that scene nervously). But there seems like in a person's (especially one who is basically aether) dying moments they are released from Tempering.