In my opinion I think the memory loss is fake only anika and rudra are in on it, they have planned to kill two birds with one stone, firstly they want to expose the NB AND PROVE THAT tia is lying and secondly they want shivay to admit his love for anika as we saw a promo not so long ago where anika tells rudra about her feelings for shivay and they are asking how could she him, maybe with this plan they want shivay to accept his love anika first and then she can tell him, but will they make a breakthrough the stone heart of sso, well I think they have made a start as in the recent olv he admits that he has a heart well that's a start lol
As far as her falling down and landing in front of him is concerned then if robin can be cremated and still be alive then shivay missing anika land on a mattress and not seeing his brother remove it and place a bag of fake blood under her is nothing much to explain is it???