There's Something About Leo Spoilers
The roles being auditioned for this episode are: Innocent, Malvoc, Sokol Guard, Sokol Leader, Vassen.
Source: Show Fax
The sisters are after Enoch demons who need to be invisible to attack. They rescue an innocent but this doesn't end the battle. The Enochs are a gang, whose members all wear a yellow and black armband. They are marking their territory, by killing innocents, so another gang, the Sokols can't take what's inside their territory. Since the Halliwells don't know who they are up against, the Enochs will try to shift the Charmed Ones' attention from them to the Sokols in order to keep the sisters busy while they finish marking their territory and also to help them get rid of their rival gang (because the sisters will now want to take out the Sokols). After Leo drops his sons at Magic School, a female Elder orbs him and tells him that there is a great power shift going on and that the Avatars must be doing their move. Brody and Paige go out on a breakfast date.
Source: Spoilerfix