To my mind, it seems apparent that the terrorists who kept the NSG commandos engaged and those who tortured and killed the hotel staff and guests were two separate groups.
This suspicion is intensified by the startling revelation that the terrorists also did not meet a clean death. Doctors who conducted the post-mortem said the bodies of the terrorists – especially their faces - were beyond recognition. The security forces identified the bodies as those of terrorists [on TV they said it was because of the presence of weaponry near the bodies].
One terrorist was shot through either eye (i.e., both eyes!!!). As the NSG commandos never got to such close range with the terrorists, and nobody commits suicide by shooting both his own eyes, it follows that the killers were somebody else. Since none of the hotel guests could have the kind of weaponry used in the conflict, this suggests the presence of a mysterious third party, making the terrorists the victims of a classic double-cross – the stuff of spy thrillers. Actually, it reminds one of the convenient murder of the alleged killer of President John F. Kennedy.
Hence it would be entirely in order to closely interrogate each and every guest, especially the foreign guests, before allowing them to leave the country. Without false emotionalism, we should also fingerprint them for the future; who knows what Interpol cooperation may throw up.