All of a sudden I think Chintu must have got plastic surgery to be sooo different that he can't be recognised. I don't know at least when i was 14 and now 22, there isn't much difference on my face, not so that no one can recognise especially if i was a threat for him or her! Those faces we never forget!
About Mayank, as i said for me he should have just recognised her from her touch and her concern, her voice and the way she worries and cares!
Sam inspite of all apparent hints chooses not to interfere even for the sake of humanity, may be he is supporting some other cause!
Thanks for the post Viggy!