The punching bag disappeared.
The result was that simple.
A grade 18 punching bag. Made with the strongest material that could be found on the market and supposedly costs millions of dollars to the System.
That punching bag disappeared.
If Jin had attained Grade 18 or maybe at its peak, that punching bag would probably have broken and leaked grade 17 bead materials from the punching bag. If he was a Grade 19, the punching bag would definitely break and cost a hole in the punching bag with some of the Grade 17 beads being burnt by the impact and friction.
But that punching bag disappeared.