Anyone played Uncharted 2?

I have a question about Uncharted 2 for PS3. Warning -- there's a small Uncharted, Drake's Fortune spoiler in this. Anyhow, I decided to get some late-night gaming in last evening. So there I was, happily shooting bad guys and jumping around ancient ruins when, at 3:00 AM, in a dark room, I found that Uncharted had made the dizzying leap from action-adventure game to survival horror. Instead of human adversaries, I was fending off really fast neck-chomping beasties while walking through d...