It turns out that in Borderlands 2 some enemies have shields, like Nomads and BUL Loaders. Some shields have minions on it, some have spikes, most are impervious to all damage and bad news in general. Sometimes those enemies will open themselves up to damage, but I can't figure out how to do so reliably and I'd rather not spend entire magazines of ammo trying to aim for the foot of these enemies.
I imagine commandos can play double trouble with their turrets, assassins can cloak and teleport around and whatnot, sirens can phaselock him for a while... but I'm a gunzerker. I regenerate health and ammo every once in a while and dual wield guns and that's it! I have to go through this the hard way... do I?
What's the trick here?