Well, how will grabbing my hand help you, when my blade is plunged into your belly? How are you going to hold my hand exactly at the position I drove the knife into your stomach? And why you think I cannot just really quickly slice open your belly, even before you grab my hand? And with your gut sliced open its not long before you pass out as well. So, if we’re talking about self-defense I can pretty realistically disembowel you actually.

How tall are you by the way?

Yep, but its easier for me to dodge your attacks. You’d find it really challenging protecting your belly area from my rapier actually. You’d likely hold your weapon on your chest/shoulder level, while your gut would be left pretty unprotected. And if I manage to dodge, get under your blade - you’re done, with your belly impaled right onto my rapier :D

Exactly

Why would I run from you and increase the risk of you catching and grabbing me, when I can fight back by quickly pulling the knife out of my pocket and (since I’m sneakier, a smaller target and also have swordfighting skills due to fencing) just plunge my knife right into your belly up to the hilt (or even quickly slice your belly open to ensure you’re incapacitated and represent no threat to me)?

Yep, but if we both have rapiers its pretty realistic for me to get inside your range and stab you in the belly :D

Thanks for advice!

Though I think it would be more difficult to stab such specific targets which you describe. So, yep, slashing is an option - but then still: wouldn’t the belly be a perfect target for a kind of combination between a stab and a cut? For example if I plunge my blade into a tall guy’s gut and then instantly move the blade up disemboweling him, or just immediately slice his belly open with my blade. My idea is that in contrast to just a stab, such a disembowelment will likely immediately incapacitate the tall opponent and also will be pretty easy and realistic to perform.

Well, I can be sneakier and dodge easier when a tall guy attacks my head. While a tall guy represents a larger target and when he attacks my head and leaves his belly exposed - I can quite easily attack him in the stomach (I do that pretty often in rapier fencing, by the way). Also belly is a larger target than head, and belly is the center of mass meaning its more difficult to deflect than head when its being attacked.