Short position takes profit → Buy back at market price → K-line short-term surge upwards

Short-sellers need to buy back positions for profit.

A large number of short-sellers buying back together:

The system executes a large number of "buy orders"

Buy orders surge → Pushes the price upwards

Market orders are swept away → K-line suddenly pulls up

What you often see:

🔺 Long lower shadow, rapid pull, V reversal

Many of these are caused by short-sellers taking profits.