Source India forums:
Shantanu Maheshwari-Nityaami Shirke and Prince Narula-Yuvika Chaufhary's performance
Even though both these acts were great, Shantanu and Nityaami's act was far better than Prince and Yuvika's. So, while both of these moments qualify for being top moments it was a shock that the former did not get a Hi5 while the latter did.
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So yeah judges unfairness is that apparent.