I (21f) am 5'5" and skinny. I recently attended a self-defense class, and there I was tought how to use a pocket knife. And as I have some male friends 6'5"+ tall, I thought that that height actually makes their belly particularly vulnerable in case of a fight (compared to a short guy/girl):
- a short person's shoulder height is around the same level as the the tall person's belly making it easier to stab/hit;
- a tall guy's belly is proportionally a larger target.
And in general, if a 6'5"+ guy stands in front of me with his stomach released (even if he has just a bit of a belly) it feels like having an exposed, large and squishy punching/stabbing bag right in front of me, into which, if needed, I can easily harshly and deeply plunge anything straight away.
I also practice historical fencing (rapier) and most of the times I stab tall opponents into the belly - my favorite thrusts are ducking counterattacks when I duck while they attack, go low and impale a tall guy's unprotected belly right onto my rapier.
That's interesting. Do you manage to land those hits consistently once the element of surprise is gone? I also practice historical fencing (but I mostly do arming sword and langes messer, though I've occasionally dabbled with rapier), and my experience has been that taller people usually have the reach advantage.
Ducking and thrusting straight ahead of you makes basic geometry work in your favour for compensating the reach disadvantage (your arm has a 90° angle giving you maximum range), but it also massively exposes your head of your first hit doesn't land, and prevents you from using footwork for a few seconds. Once your opponent's has figured out your strategy it would seem like he would just have to stay a bit out of reach and counter-attack/riposte while you recover from your ducking
Well, I'm pretty good at landing those ducking counterattacks into a tall opponent's belly, even when the surprise element is kind of gone. The key issue here is to be quick, to duck lower under the opponent's blade and to disengage quickly enough after I land that hit into the stomach. Such a kind of counterattack is called 'passata soto' by the way. I rarely get hit in the head when doing it.
Seems like maybe you've just been fencing novices? Based on my experience, that just doesn't seem like it would be very effective against anyone who knows what they're doing.