Raids Regen
Hulk buster healing back up to 94 million health, when reaching 15% health (twice), Got Hulk Buster down to 15 % (twice) and he regens about 3.1 million health per second, if you don't stun him. So he went from 15% health to 80% TWICE.. This normal? even if u stun him within 4 seconds (example) he just gained about 12 million health,