Apocalypse coupled with Mind Stone

Glockoma Posts: 283 Mover and Shaker
I have the titular support attached to Apocalypse in which the “supported characters powers deal an additional xxx damage to enemies.

In both of Apocalypse’ damaging powers, I have noticed the perk working with each successive hit of his red and black (4 hits then increased by xxx from the mind stone). But when I fire his yellow first to get the most out of the damage, I lose the perk of the mind stone. It’s like it replaces that part of the perk. I don’t know if this is intended.