That isn't what that sentence means... Think of it like a squirt gun. If someone is spraying a squirt gun at you, a mask will protect you a bit, but it eventua

That isn't what that sentence means... Think of it like a squirt gun. If someone is spraying a squirt gun at you, a mask will protect you a bit, but it eventually will be saturated and you'll be wet. However, if you have a face shield, the water will just roll off. Masks are better at protecting you from small particles. Using a face shield without a mask would do you absolutely no good when you're trying to protect yourself from an airborne pathogen or micro-droplets. When you breathe, you're going to draw in air from around the sides of the shield. If you have a mask (N95), then you're breathing air in through the filtering fibers of the mask. This is what protects you. Masks and face shields have two very different purposes.