Yes it is true the Indian craftsmen were/are masters in precision. I guess the idea must have been that when/if the outer katar, which is not sharp, but have a very thick blade, got stuck between two ribs; you could draw the inner katar. Notice that it is not the same katar shown, the first have an older inner blade, and the second one has an inner blade made at the same time as the outer blade.
Here is another example of precision work, the two blades are parted in the middle.
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