Many things happens this days, putting you on a test! At what situations did you think you can sell your bitcoin and forget about bitcoin like it has never exist in your life. Knowing well the situation you're into many must have passed it and scale through without selling. What then will make you to sell even if the price is against you?
OP please you can do better than this. Assuming the man in the story has crypto worth N10 million do you even think at the banks wouldn't flag his account if he sells such huge amount of bitcoin and amount enters his account. I hope you have heard of the anit-money laundry act. So think this is going to be a problem for both him and the kidnappers It makes absolutely no sense.