Accident

Professor Nina gave him an unimpressed look before saying, "I'm not a science teacher, so I don't know if I can explain it clearly enough for you to understand."

"But let's say you have a ten meters large balloon filled with aur. If you nick it and it explodes, the sound of explosion would be loud and the air inside would want to flow down outwards, right? If you are standing close enough, the air pressure might even push you back." 

"Now let's suppose you compress that air in a just one-meter large balloon. The air quantity is same, it's just compressed while balloon size is several times smaller than the previous one. If you nick it now, be it sound of explosion or the air pressure, both would be many times more higher. If the first explosion had pushed you just one step back, the latter might push you five, ten, or more steps back. She is trying to do the same here."