How does Indestructible interact with Akarat's Champion Prophet?

Question

Indestructible

When you receive fatal damage, you instead become immune to damage, gain 35% increased damage and gain 107284 Life per Kill for 5 seconds.

This effect may occur once every 60 seconds.

Akarat's Champion - Prophet

Explode with the power of your order, increasing your damage by 35% and increasing your Wrath regeneration by 5 for 20 seconds.

Prophet rune: Gain 150% additional Armor while Akarat's Champion is active. The first time you take fatal damage while Akarat's Champion is active, you will be returned to full health.

Which triggers first?

Answer 1

From this video of Dossou, it looks like Indestructible triggers first. Any additional background/reasoning (such as always passives then actives) would be appreciated though.