During samudra manthana, Amrita was distributed to Devas by Mohini, who is an avatar of Lord Vishnu. However, the demon Rahu gets to drink Amrita by deceit. Surya and Chandra recognise Rahu and alert Mohini. The question is why didn't Mohini recognise Rahu? If She knew that Rahu is getting Amrita by deceit, why did She give it to him?