Interesting video

Indeed, the invader in that video should have been vanquished long before that fight ended.

@ Carphil: I am not at my ps3 right now so I can't check, but if you go players met, then pick someone, there are four buttons or so on the bottom, is one of those for reporting someone?

Hmm not actually, that last button is to Block list. Close call.

Closest I have found so far:

http://uk.playstation.com/ps3/support/general/detail/linked233999/item305388/Grief-reporting/

You should see the infinite stamina modders, my god. Bleed weapons become terrifying.