I have Rare claw that have CtS to cast amplify curse. never saw it works in dragon talon. Is this bug?

Ps. In Diablo2 CtA and Cts work on talon. But I dont have any idea that work in HU?

I think with dtalon it depends which claw you put on first. I think one claw show still have 100% durability ( rare claw in your case) the other should have lost point in dura.

Primary claw is always glove side of char. Same as vanilla. Any ctc will come from that weapon. Also iirc only that claws ias will count, secondary claws ias is ignored. I know it works that way on traps for sure.

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"The difference between genius and stupidity is genius has its limits" Albert Einstein

thats true if you have just entered the game. The primary claw can be the boots side if you equip that side first. It will revert to the gloves side again when you re-enter the game though.

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or if you weapon switch, etc.
the fastest attack speeds possible in vanilla used the boot-side mechanic (2 frame attack speeds for sins).

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The reader should not be discouraged if...he does not have the prerequisites to read the prerequisites. P. Halmos