I think Fionwe might be right on this one, if I've read the debate correctly.

It seems like all shields are the same in the series. Lanfear calls a shield a shield, and if there is any weave that passed down through the ages it would be that. Shields are always described in the same way - if they are very strong then the person describes them as a glass wall, and if they are weaker they bend.

The quote with Liandrin/Moghedien clearly represents the knot. The fact that Liandrin can identify it as a shield implies that shields are the same. We have seen Nynaeve unable to decipher what Moghedien is weaving as a counter example. We've also seen SH remove the Source from the FS, and they know it's not shielding.

Liandrin then goes on saying that the complexity of the knot is horrific and she loses sight of it. Moghedien says only the FS can unravel it - it's clearly about the knot and the not the technique. We've seen Osan'gar I think say that he could unravel any shield with time, so that goes against the technique and more about the knot being the way past shielding.

If you sharpen the edges of the shield you sever the person. That much is made clear with Nynaeve's duel with Moghedien. We also know that Asmodean severed his mother so it's likely Nynaeve's claim about this subject is not dubious and it can be done by an individual.

Berowin says that she has 'honed her skills over time'. I think she does the exact opposite. I think she makes her weaves blunt and soft, and they bend like elastic bands. It is similar to Rand encountering soft spots when the AS held him and him saying that they can't be broken. This of course takes time and practice to master.

If Berowin tied off her shield then Rand would probably be able to break it, but only by unravelling the knot. Her weave per se is invincible due to its durability. Moghedien's trick would not work on Rand or other educated channelers. You can unravel a horrible knot, it just takes time. Heaven knows how long - maybe Rand would need hours or days on Liandrin's weave? This is obviously why Rand didn't shield Semirhage and perform a complex knot - he knows she'll eventually escape.

Lanfear's shield on Asmodean is a partial shield. It's identical to hiding your ability and partially hiding your ability like Mesaana did, in a way. His shield is probably difficult to break because he can't cause that gradient between himself and the True Source, and as she said, there is obviously some pain involved, though I'm not sure what this is because we've never seen similar 'pain'. It's possible he needs to try and draw his maximum but because of the partial shield it feels like overdrawing, and thus the extreme pain of overdrawing. The shield will eventually buckle but he won't subject himself to this. It's also likely she lied about the shield dissipating.

It seems like there are only two real types of shields in the story - shields for men and women. Rand himself said he couldn't remember how to shield a woman, so the technique is probably different. If you sharpen the edges with skill or a circle you can sever someone.