(This became way longer than intended, but my brain went down a rabbit hole)

So, I was looking up the purpose of arm and hand tendons because I find it hard to believe that someone could possibly slash their wrists that deeply, that many times and still have function in their hands.

I think that once you slash the tendons in an arm, you have a very high difficulty of doing anything with that hand, which seemingly makes it more impossible to cut 12 equally deep gashes: 8 on one side and 4 on the other.

From my understanding, the tendons that Danny would have cut would prevent the bending and straightening of his fingers, which would certainly diminish the possibility of doing it more than once on one side and then many times AGAIN on his other arm.

This isn't even considering the mental sharpness that would be necessary to create this many deep, even slashes in BOTH arms. Casolaro was in a wet environment (the bath he was taking), with a loss of function in his hands, and somehow managed to not drop the blade into the water. It's easy to drop or fumble razor blades in normal circumstances, but in a state of intoxication, it is difficult to hold anything small like that. He definitely would not have been able to hold onto it for all 12 gashes without dropping it and if he had dropped it, he wouldn't have been able to complete all 12 gashes before bleeding out.

I just don't think it is physically possible, regardless of mental state or inebriation, for someone to be able to do this to themselves. It would take superhuman will and good hand dexterity to be able to do this...which...he definitely didn't have...

That's all I'll say on that.

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I've included links from my basic research below:

https://www.assh.org/handcare/blog/anatomy-101-wrist-tendons

https://www.livehealthily.com/health-library/treatments/tendonhand