Mechanics of Catarina Bloodline (Prolonged Servitude) + Minion Instability

I have a question regarding how the line "Minions cannot be killed, but die after being reduced to 1 hp" combines with Minion Instability "Minions explode when they reach low life"

I have two theories on what would happen:

1. Does the explosion cause the minion to die when they reach low life? If so, the minion isn't killed, but it still dies, because of the explosion?

2. Will the minion continue to live after reaching the lowlife condition, exploding only on the tic when the condition occurs? After the explosion, the minion is still alive, being able to be brought up past the low-life threshold again though the use of flasks or minion regeneration.

I plan on testing this mechanic when the league launches. I will spec into minion Instability and Prolonged Servitude, summon a minion with elemental army support and wait for the lowlife condition for the minion to proc instability. If it procs, and the minion is alive after exploding, I will use a flask with recovery granted to minions to bring the minion's hp to above the lowlife threshold.