In the first video, Nika is wearing standard issue office clothing, any color top, either a skirt or slacks, but with black nylons and black (or any color) patent-leather, closed-toe high heels, preferably with
light-colored, scuffed soles. She's just walked into a kitchen with tile floor or living room with hard wood floor, whatever is available easily.
She's on the phone with her best-friend/co-worker, and is here checking on the house while the friend is gone. Her friend had a nightmare that all their friends and co-workers were turned into Cheerios and spread around the house. Nika sees this is in fact exactly what happened and is shocked but delighted to find them all now at her feet. While on the phone with her friend (we only hear Nika's side of the of the conversation), she tests out crushing one of them with her shoe, and can barely contain her excitement.
She knows exactly who it was and how terrified they were to get stepped on.
Nika doesn't want her friend to find out this is happening, so as she goes around the room, she talks about the people and what she "would do", pretending to just be venting about work, but actually going through and exacting her revenge on everyone, her friend on the phone none the wiser, but slowly becoming suspicious. The shots would be a combination of POV and cutaway to see her crushing the Cheerios and grinding them under her shoes.
The idea being, she's looking directly into the eyes of a victim, smiling at them as she pretends she's saying things she would never actually do, but in reality doing them and enjoying it.
Finally, Nika confesses she's crushed everyone, and when her friend threatens to call the olice, Nika snaps her fingers and suddenly the friend has teleported there and become a Cheerio. Nika puts down the phone, gloats for a second, and crushes her.