Startled with the terrifying damage of the glass warhead

Glass materials are often broken so they are not used in the production of warheads. But there are actually bullets made of glass, will it become a dangerous weapon?

Taofledermaus account on Youtube posted a video recording of the experiment process with 4 homemade bullets with glass warheads. When the bullet is fired, it is also the time when the glass warhead is broken but the force of the gun still causes it to fire with great destructive force and can cause damage.

1. Can humans avoid bullets flying like in action movies?
2. Why is the sandbag blocking the flying bullet?