the period of debt payment is the main concern

What is the reason that banks do not give you a margin call and dont force you to sell your holdings. Obviously,because the banks believe the value of asstes that you hold.

Then why the banks wont chase the debt of BNB until 2011? They had the right to review BNB's debt before, but they didnt.. why is that..

Previously BNB's share price trumbled becuase of possbile debt review, and it was reasonable. However recently, its share price trumbled because of the board chage, from my point view it is a reaction with emotion rather than a reaction with efficient.

The only one possible reason for BNB fall into a liquidation is the banks ask for the debt to be paid immidiatly, but the fact is there isn't.