Though you almost always have to goat him by shooting him once around the corner - otherwise he’d just continue standing behind the bend.
Also the coming near can blow up he doesn’t do the floor attack and instead comes to melee you. Then if you jump directly up you are instantly killed by being flung against the ceiling.
Can’t have bosses without stomp mechanics…
Most of the time I just make myself visible and he comes my way.
Once he's coming towards me I put a couple Anarchy's in his chest (maybe a Nova Bomb if space allows) and get the hell out!
I can't say he hasn't stomped my ass a few times but I generally survive it unless I'm far enough under that I don't get stomped out of the hole.
Edit...
I should have added that yes, I have had to fire at him a couple times even though he is staring at me but won't move.
It's almost like a stand-off as to who's going to chance it first. 😁