Push them in the pool

Chloe is standing at the very edge of the water, holding her phone up to catch the light on her face for a selfie to send to Jason. She’s focused on her reflection, pouting her lips and adjusting her posture.

You don't just nudge her; you deliver a sharp, concentrated burst of kinetic energy directly into the small of her back.

"Hey!" Chloe yelps, her arms windmilling as she loses her balance. With a massive splash, she disappears beneath the surface of the crystalline water. Her phone, luckily held high in her final reflex, clatters onto the concrete deck just inches from the edge.

Kenzie jumps up, her sketchbook falling to the ground. "Chloe! Are you okay?" She rushes to the edge, kneeling down and reaching out a hand as Chloe surfaces, sputtering and tossing her wet hair out of her eyes.

"What the hell was that?!" Chloe coughs, grabbing Kenzie's forearm. "I didn't even slip, it felt like someone—"

Before she can finish the sentence, you strike again. You sweep through Kenzie’s center of gravity, a cold, heavy **** that unbalances her kneeling form. Kenzie lets out a small "Eep!" as she follows her sister into the deep end with a second, smaller splash.

The two girls surface together, treading water and looking at the empty pool deck with wide, panicked eyes. The water is perfectly still around them now, the ripples from their fall the only sign of chaos.

"Mack," Kenzie whispers, her voice shivering despite the sun. She isn't as angry as Chloe; she looks toward the spot where you were just standing with a look of terrified awe.

"That wasn't funny!" Chloe screams at the empty air, though she’s clutching Kenzie’s hand tightly under the water. "You nearly broke my phone, you creep!"

From the upstairs window, you see the curtain flicker. Tyler has been watching. He saw both girls get dumped into the water by nothing at all. He’s staring down at them, his mouth hanging open, his grip tightening on his mouse. He realizes that while he’s struggling with code, you have the power to physically dominate the environment.

Alexis sashays onto the back porch, attracted by the screaming. She takes in the scene—the girls in the pool, the dry concrete, the lingering "charge" in the air. She leans against the doorframe and lets out a loud, delighted cackle.

"Having an early morning swim, girls?" Alexis calls out, winking at the empty space beside the pool where she feels your cold resonance. "I told you this house had a big personality. I think Mack just wanted to see you wet."