"We are the champions..."
another thing i didn't notice the first time through: just how rarely Lorne is of any help at all. here our Heroes belt their hearts out, and he just lets TPtB do the talking.
Well, as he says, he knew the PTBs were about to send Cordy a vision, and that answered the question the gang was there to ask - what to do with their lives now. He didn't need to say anything because he knew the answer was about to be made very clear: keep on saving people.