I've been soloing v2 Instructors lately but I keep dying at the part where you have to get Cygnus' HP down enough for v2's to be summoned. Before I die however, I notice this strange demonic looking icon above my head? It stays for a few seconds until I suddenly see all 13K of my HP gone. What bugs me more is that I survived it one time with 1 HP remaining.
What is this? How do I avoid or even prevent it? I'm trying to cut down on wheels.