How does one way bulletproof glass work?
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Normal bullet proof glass is layers of hard and soft material. The hard material deforms the bullet and the soft material absorbs the energy. The more deformed the bullet, the more area its pushing on, and the more material there is to absorb that energy
One way bullet proof glass only has the hard material on one of the sides and not in layers within. This means that a bullet fired from inside passes through the soft material in its streamlined form, then passes through the hard material and deforms. This steals a fair amount of energy from it but its not going to need to travel far to hit the threat
Bullets fired from the outside still hit the hard outer layer and begin to deform and have their energy more easily captured by the softer layers on the inside
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