A suffusion of yellow
Im not sure that Agnes and nu-Pietro have the same Source/Controller. Agnes has tended to be helpful and protective of the town and the twin children, she’s also shown a healthy deference to Wanda. Pietro on the other hand has been a disruptive element, disturbing the town and children (Wiccan at least) and has been provocative towards Wanda. Their roles seem to be opposite (though perhaps both focussed on the same goal).It felt to me like whoever was previously controlling Agnes is now controlling Quicksilver, given that he’s now the one hanging around keeping an eye on the family in much the same way she was previously.
Perhaps that gave Agnes a chance to try and escape?
One thing’s for sure, this show is setting a high bar for the shows that will follow.
Just recalling too that it still hasnt been identified who Jimmy Woos ‘secret witness’ was - maybe Agnes is the witness and she was trying to reach Jimmy while Wanda was distracted by nu-Pietro.
it is a high bar, I’m quietly confiedent that the next few series will do their utmost to keep pace with Wandavision, so 2021 looks like a good year for streaming superheroes
edit: corrected name from Wanda to Agnes