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i saw this scene sometime during the late 00's on the latin american teen channel boomerang, but it's probably dubbed from an english-language show, or at least not from a spanish-language one.
two teen girls (both white, i think) are in a pool or some other body of water, and they make a blood oath by making a small cut in their palms and then grabbing each other's hand. when they do this, one of them, who may be a brunette, says the line "hermanas de sangre", which translates to "blood sisters". the line may be different in the original language. then the live action scene shifts into a still comic vignette of the girl saying the line. the girl may be antagonistic, and she may have come sort of supernatural power (being a witch maybe?) that might make it dangerous for the other girl to be her "blood sister".
i'm pretty sure the scene was from a "last week on..." recap of the actual show, and i have no real recollection of the plot, so my best bet is on the art shift. has anyone heard of this?