These are accidental eye pokes, they weren't done with the intent to finish the fight. If they were that's a different story.
And as I have been saying, if someone does eye or groin attacks with intent first, the other guys may not get a chance to return the favor.
It was a slight grazing finger and it immediately affected him. Imagine if he did it with intent.
I don't get what the defensiveness is about just admitting that these strikes are dangerous, even to a trained fighter. No skilled martial artist relies on them, but we should accept the risk is there and it could be somewhat of an equaliser.
Bas Ruttens go to move in a street fight is apparently the kick to the groin, despite being renowned as one of the most powerful strikers of all time so that says something.
There are finishing chokes from Kesa that don't require removing the arm in addition to the arm triangle, such as the fist neck compression with the free hand.
Regarding knees to the spine yes maybe if you have it quite upright and the guy is trained at using knees powerfully. Still, you are talking as though modern sport BJJ is trained with MMA striking in mind which is not the case at all, let alone illegal strikes.
Let's not forget Renzo vs Frank Shamrock. As Frank put it "while Renzo was doing his masterful Jiu Jitsu, I knocked him out from the bottom" (in side control).
The 'winner' of the bout after
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You could argue that Renzo could have also kneed from that position. Yes, but Frank
still proved a point. If the position is vulnerable to knees then its not a real fight anymore it's a grappling rules match and he wasn't going to go down like that. We are taking the same principle here one step further by hypothetically considering no rules at all.
So let's not pretend that modern sport grappling is generally geared towards even defending strikes, let alone illegal blows. I don't see therefore how the modern sport grappler will be prepared to defend these strikes, particularly against someone who has had training themselves.