The sisters and Chris unknowingly take part in a demonic reality TV show entitled "Witch Wars" where they are the targets and their powers are the prize.
Did You Know?
When Paige is handing Phoebe potions she lists off an explosive potion, acid and smoke bomb. From Paige's POV the acid potion is the green one and the smoke bomb is the yellow one. From Phoebe's POV the yellow and green potions have changed position. See more
That explains how the demon knew that a witch had died last night... he watched it on TV. Pretty sick.
No sicker than any other Reality Show.