I feel the reason behind asking Urvashi to mock Delnaaz is not to unmask Delnaaz but actually to unmask Urvashi. What Delnaaz said in that speech was in front of all but what Urvashi did was in private so Salman wanted others to know that how Urvashi speaks about them in their absence. He further included Mink so that others may also know that Mink was the part of that mockery too.
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