I did this test a while ago, but it's worth mentioning again here. It relates to a stat of 0.
Life1 is derived by this stat, which the HP healed = Vitality/Stamina * 5 on revival... however, you know that's pretty crazy when the stat is 0.
In battle, they are revived with 1 HP.
Outside of battle, they are revived with 0 HP. Normally you would think they would go back to dying in battle, but that's simply not the case. They do, however, die right after taking damage.