C691 Throw the grenade in

Just then, before the officer could open the lock, a bold officer took out a grenade. He ran up to the window and opened up a machine gun to force Gui Ziliu to retreat, then threw the grenade in through the window.

This throw was not a big deal, but everyone who saw it was shocked, not only Gui Ziliu and the others were also shocked, they were also pushed back a few meters