Yeah, I think Bug Hunt is just a Multi Player level, a shame as think this would have suited offline split-screen play.
As to the AI getting better, I wondered why I was suddenly getting my ass kicked!!! I was about 2cm away from the dropship ramp on Sulaco Falls when got blasted by a grenade, my dead body could hear them talking about the mission being done and they were leaving!
Yeah, no "Oh, poor Winter" just "ok we're off!" Christ at least Leon, Chris, Piers, Helena, Sherry, and that smug git Jake in RE6 care if the player dies!!
I'm so glad I already got the Bad Ass trophy already - just need to finish all the challenges (damn that leap on 3 targets in 10 seconds, it's still there mocking me!).