Tiff between Armaan and Riddhima

Tiff between Armaan and Riddhima

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S1 E2: After Riddhima runs some clotting tests on a patient, she gets in to an argument with Armaan. However, Kirti intervenes and later confirms Riddhima's diagnosis and treatment. Already miffed, Armaan then warns Riddhima to be careful. Why is Armaan so annoyed?