Lance Corporal Marcus “Bull” Thorne was the nightmare of every recruit and smaller soldier on base. Weighing 90 kg of pure, solid muscle, with a shaved head and sharp blue eyes, he always dominated the space and attention. Bull often boasted that he could pin down three men at once without breaking a sweat.

Yet, everyone agreed there was one person Bull never touched: Sergeant Anya Petrova.

Anya was a recent transfer, in charge of the armory. She was known by the nickname “The Quiet Girl.” Slender and small, she always wore her uniform impeccably clean, her hair in a neat bun, and never made eye contact with anyone. She was practically invisible, except that every marksman had to admit that the weapons she maintained always functioned with terrifying perfection.

One lunchtime, the mess hall was packed. Bull was sitting alone at a table, devouring his enormous meal. Anya, as usual, was sitting in the farthest corner, quietly reading a book.

Bull suddenly felt bored. He needed a show. His eyes swept the room and landed on Anya. “The Quiet Girl” would be his victim today.

He stood up, his heavy steps making the floor tremble. He kicked away a chair near Anya’s table, the BANG silencing the entire mess hall.

“Hey, fresh meat,” Bull growled, standing to block the light, casting a shadow over Anya’s book. “This table’s taken. Your greens look tasty, let me have a bite.”

Anya did not look up. She softly closed the book and placed it carefully on the table.

“Didn’t you hear me?” Bull sneered. “You’d better listen to me, or I’m gonna shove your pretty little head…”

Just then, Bull’s movement froze.

He didn’t know, she was a “ghost weapon.”

No one saw how the slender girl moved.

In just a blink, before Bull could finish his threat, Anya was on her feet. She used the High-Tech Self-Defense System (Systema) technique learned from a top-secret special forces unit. She didn’t fight Bull’s strength; she used his $90 \text{ kg}$ mass against him.

• Step 1: Anya’s right hand flashed, lightly touching Bull’s clenched wrist. A subtle twisting force caused his massive arm to lose balance.

• Step 2: She slipped behind Bull, small enough to be nearly invisible. She placed her knee behind his kneecap.

What followed was the sound of collapse.

With a dry crack and a loud CRASH!, Bull Thorne, the $90 \text{ kg}$ Marine, fell face-first onto the tiled floor, his head colliding with his own food tray. He lay crumpled, groaning, not from pain, but from shock and humiliation. His entire strength and ego had been neutralized in less than a second.

Anya didn’t say a word. She just looked down at Bull with cold eyes, then bent down to pick up her book. She glanced over the gaping crowd, and calmly walked out of the mess hall.

Everyone looked at Bull, then at each other. Since that day, no one dared to bully anyone in the mess hall again. And everyone knew, the nickname “The Quiet Girl” wasn’t because she was timid, but because she didn’t need words to prove who she was.