Don't die

First of all, let's rule out the possibility that the Archdemon is a human spy. 

There are countless strong warriors who want to kill the Archdemon, so many that they would need to take a number and wait in line. Just the ones Mike knows include: Maxen, Calderon, Cedric, Shadow Nine...

Hmm, it seems like all the strong warriors want to kill the Archdemon. 

For such a being to seek help from Shadow Nine is utterly ridiculous. If the Archdemon died, Shadow Nine would probably pop champagne on the spot to celebrate.

But to Mike's surprise, Shadow Nine actually moved in response to the Archdemon's plea!

"Calderon, that's enough. Stop now."

Shadow Nine, holding a blade in his left hand, appeared between the Archdemon and Calderon.

"If you kill this waste, you'll die too."

Shadow Nine wasn't stopping Calderon to save the Archdemon; he was trying to save Calderon?

Mike nodded slightly. That made sense.