So I think I just got Zerged by bungie!
I was checking out the lootcave that one of my buddies was telling me about, and I guess I was there a little too long. After about 40 minutes a flood of fallen and hive spawned out of nowhere! It was pretty awesome! Didn't die and I eventually killed them all, but I didn't stick around after that either.
I was wondering if anything like this has ever happened to any of you?