Here is the reply:

"Good Afternoon Robert,
A barbed broadhead is one that has a blade design that acts like a fishing hook. Where the broadhead will not be able to slide back out of the wound because the blades are "hooked" or "barbed" into the flesh. Some mechanicals have been classified as barbed because once the blades open they pretty much stay open for good. However, our Tekan blade design is designed to stay open during penetration through an animal but will collapse again under moderate pressure. Our website says prematurely and that is because a rear sliding blade has the potential to close during penetration where our ratchet design holds the blade open until moderate rearward pressure is applied and then they will collapse. Therefore, it isn't classified as barbed."