Maybe it is the first Cartier on this site?
I know it is not a normal type here. It cannot be knocked directly. Twist the top to knock indirectly and propel the 0.7mm lead.
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I have an old Cartier Must ballpoint in a polished steel body. Deployment is done by twisting the rear. Light detents, but good friction. So seems logical that this is a twist as well. Spring loaded? Or continuous rotation?
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It is not a continuous type. I like Cartier Must ballpoint steel too 
What is twisted here? Only the “push” knob or does the clip rotate, too? Either seems not unproblematic to me (the first uncomfortable, and the second could scratch the barrel?) …
You can only twist the shiny plain knob clockwise to propel the lead.
The knob could not be pushed. The clip stays put and it doesn’t rotate.
BTW, I will feel uncomfortable if the clip scratches the barrel too. 