He technically has a shield, but the shield's massive roid/melee damage bonus only applies when the shield is depleted. He's also getting back massive amounts of health when he attacks with his Rubi weapon (it gets back 12% of all damage inflicted when you have it in your hand, even grenade or gun damage).
I agree though, those constructors are vicious and still scare me. Apparently you can "cheese" them by getting behind them as I guess they can't rotate or turn to face you.
Oh right. I knew he had a shield, just the fact that he went at it with it depleted. I know that is how the build works...just that the concept of facing one, close, without a shield, terrifies me at the moment.
As to cheesing it--I discovered that on my first encounter with one, the mission where you rescue Roland (the second part of mission--failed the first one because, well, wasted by constructor on 3rd attempt so they moved him to the prison). After being owned by that thing 6 times, I eventually got pissed and ran right at it and found myself behind it--basically using it for cover from a badass loader. I unloaded my corrosive SMG and watched as it could neither move to face me or damage me with any attack. seemed...too easy.
Every time I have killed BNK3R, it has been from the Bore glitch. (As Zero)
I just keep sniping him for minutes on end, then randomly, a single bullet makes the "brrrraaapapapapappapap" sound (hitting thousands of crits simultaneously) and he dies.
Bore is awesome!
heh, I finally beat bnk3r on my first attempt yesterday after reading the suggestions here. I tried both safe spots, but got bored with the vending machine one quickly because the boss moves too often, then I just got bored standing by the chest up top. I found that focusing fire at all times with my corrosive SMG, rather than waiting to snipe its guns and weak spot when available was much better over all. Also, more mix of phaselock on the guns to one shot them with minimal targeting helped. I've been doing that on threshers anyway. The loaders weren't much of a problem--in fact, they really didn't spawn all that often on that run. Maybe I was suddenly lucky?
The Angel fight was sweet.
The two things I really like about this one more than the first is that it actually has a storyline--mostly because the characters are conceived quite well and executed perfectly.
The humor is also better overall.