Patriarch rage mode

[Covert Cactus]

I made a few attempts at killing the Patriarch in rage difficulty and had no luck so far. The enforcer wasn't too hard to cheese but seems like it's going to be harder. Anyone beat him yet?

Edit: I beat him. Grab the explosive bolt gun on the stairs to the rights when fight starts. Use invisibility and slow mo to get close to him and stick bolts in him. Each 1/3 of health you take off triggers common enemies to come in to the room. Use them to build your slow mo gauge back up and go back to hitting him with the bolt gun. During the 2nd wave of enemies another meat gollum attacks. Ignore him and just focus on the common enemies and continue blasting the Patriarch when he returns.