Every single spike inside the cage was at least one foot long.
Once inside the cage, following the instructor's guidance, and assuming the standard stance, the cage started to shrink as soon as the instructor pressed his hand against it.
What little space there was for movement quickly condensed. In the blink of an eye, from the top of the head down to the limbs, front and back, every vital point was encircled by countless spikes, making any movement impossible.
They were right against the skin.
Feng Yin could only feel his scalp tingle and his mind buzzing. If the cage closed completely, wouldn't he instantly become a human porcupine, pierced by thousands of spikes?!
Fortunately, the moment the spikes touched the skin... the moment the skin felt a slight sting, but before they could actually pierce the skin, they stopped, completely stopped.
Yet, even though the spikes ceased their advance, Feng Yin's sweat still inevitably started to flow.