So people are asking the differences in reverse S curves and traditional hawkbills in respect to self defense. I am posting this to show the differences and the advantages of this S over the traditional. I will use the Spyderco Civilian, Spyderco Matriarch and Spyderco Tasman Salt for comparison purposes.
Part I: The Knives
As you can see, sizes differ dramatically but for this demonstration, it will not be that important. This is just to get you fimaliar with these blades.
Part II: Where the Knives Cut
As you can see, the reverse S curve is going to cut where the hollow belly is, 'trapping' everything inside and cutting it. The hawkbill can cut anywhere, depending how it is deployed.
Part III: Trapping
This is where the reverse S curve starts to excel...notice how on both areas of the wrist there is coverage by the blade itself and no area is left uncovered. This is a 'no place to go' scenario. A limb caught in this moment is fully under your control.
The even meaner trap of the Civilian
Notice the Tasman leaves some to be desired on a trap. The tip is not at an angle for easy penetration and the wrist can easily be pulled off.
Part IV: Blocking
Notice the Matriarch leaves a lot more of its tip out and away from the user as does the Tasman. It is angled for a much easier and likely to be successful block.
Part V: Cutting
Notice how deep the Matriarch is in and how shallow the Tasman is. Applied to real life, an inch deeper cut can be everything.
How deep did they cut?
That is not a small difference at all...
-Reverse S Curved blades give the user more control because of the belly design. It also allows easier penetration and quick and effecient cutting over traditional hawkbills. For blocking, trapping and passing, the blade design excelts and a paper thin tip makes penetration of flesh like materials easier than traditional hawkbills. Overall, this combination makes a vicious slicer which is what the Civilian and Matriarch are. An even smaller version would likely serve as well, given the paper thin tip is present. It also indicates beefing up the tip on the Civilian is a bad idea. This type of knife was born with self defense in mind and still today, it excels in protecting.