Man, what's up with respawning enemies in Borderlands? That kind of sucks. I got all the way through this huge cave, ending with a battle with like 10 alpha skags that just about killed me, and then on the way back there were 2 badass fire/corrosive skags that respawned. Not only that, but as I was fighting those, the entire outpost of bandits behind me respawned, including two more badass enemies.
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I made it out, at least.