Technically it is not shedding - it is transmission from people that got the injection to the unvaxxed.

The point is that the spike proteins are toxins that do a lot of damage to blood vessels, lung tissues, etc. If someone had enough spike proteins in their lungs to be transmitting them to others by breathing... they would be too sick to be around any people in the first place. You can't have it both ways.

The spike proteins can't be harmless to those that have received the injection, but then magically become harmful only to those around them during transmission. So from that fact alone transmission is bullshit that makes no sense from a practical perspective.