dont worry, nothing will happen there are no connection with dubai bank and doha bank, they cannot do anything, but he would not be able to enter dubai again unless he pasy the loan back. Honestly speaking he should not have done this, the bank might chase him by calling the home etc. Best advisable thing is that he should contact the bank and gradually pay the loan back, it is very easy to pay from here if he has the money. If not I dont know what to say