518 Materials 5yr

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"We have already asked for help. Well, what's your name?" asked the leading officer.
"Jiang Liushi, Shi Ying Squad," answered Jiang Liushi.
Presently, the hall was filled with ordinary unarmed people. They had no way to fight back at all.
"Everyone, stay away from the windows. We'll hide here for a while. There should be no problems with that. Unfortunately, there are many injured amongst us," said the officer.
However, after completing his sentence, a loud sound came from the underground while the whole building started shaking. Many of the gathered survivors screamed in panic. 
"What happened now?" asked Jiang Liushi while staring at the ground. "What's this disturbance?"
A dozen survivors ran as the concrete floor covered with marble suddenly bulged, and a crack broke open.
The moment that happened, Jiang Liushi shot several times into the gap swiftly. Everyone was startled, and they all stared at the crack in panic. In that black crack, dirt, cement fragments, and shattered