There are a lot of things you can't comprehend.

The sheep die in exactly the same way in halal/kosher slaughter or as despatched in the abattoir I worked in - in both cases, by loss of blood from severed vessels in the neck. The only difference is that the abattoir was a far more terrifying place to be in the last hours of their lives. The animals were delivered to holding pens right next to the slaughter end of the plant. The smell of blood and guts was overpowering, accompanied by clattering and banging of machinery and the screams of livestock.

Halal and kosher rules forbid treating animals like that.