If I hear one more old-wives tale about swords, I'm going to track down the poster and knock him silly with a large cudgel. No, there is no real suction in wounds. Muscles don't "clamp down" on the blade, making it difficult to pull out. The term "blood groove" is a balogna fantasy word, a strictly modern fabrication that completely misleads as to the function of the fuller, as the prior poster stated. It assigns a false attribute to the fuller based on an incorrect assumption. If you don't know what you're talking about, don't talk about it! Next myth to be debunked is the "bashing through plate armour" one, I'll wager.