Okay, I guess I'll answer the death slash questions. I still play SS64 a lot since I have a HNG64 that works perfect. It happens to be my favorite of the SS series.
Anyway, the death slashes....certain basic attacks by characters, when used to kill your opponent, start an animation in which the camera moves behind to character being killed. The screen turns into a black and white sketch art you either see blood fly out of their chest or a slice and their body falls into two pieces. It's actually a really cool sequence. Nakoruru, Rimururu, Shiki, Gandara, Deku, Dekuina, Kuroko and Yuga cannot be killed.
The other black and white animation is when a fatal slash BCD connects. It works the same way as SS4....ABC to trigger your Rage Eruption, BCD for the fatal slash. When it connects, the game quickly cuts to a black and white sketch with a close up of the character who connected the fatal slash. It then fizzles back into 3D and the character either falls over if it kills them, or goes back to fighting if they are still alive.
Someone mentioned Bust Hanzo's bone breaks....Those work very similar to the chain grabs King and Armor King have in the Tekken series. They are very powerful and can be broken with the right button press.
And Ukyo...he has TB....that's why he's coughing up blood.
So if anyone ever has any questions on the game....feel free to ask...I'll be glad to answer.