I completely missed first time Brian's words:
"Clark needs you to help him. He told me to get you. I think he's dying."
Now, this story has been out so long that I don't remember for sure, but was it like this: Lois knows that Clark is Superman, but Clark doesn't know Lois knows. Clark warned earlier Brian not to tell anybody, but now it was such an emergency that Brian talked about Clark, not Superman.
