The song is fine minus the weird creepy effect but I failed to understand if it was a very very very poor attempt of presenting a tandap or was some female spirit there in his body at that moment (looking at his mudras)..
Bold: Actually you are correct he was acting that Manjulika's ghost/spirit has possed him in this dance performance.I don't know much about dance so I won't comment on it.
I was happy to finally get a male version of this classic song happy for Arijit too I think he got a song after a long time