International credit transfers

"The receiving bank maintains an account with the sending bank. Alternatively, both the sending bank and the receiving bank may maintain accounts with a third bank. Then the sending bank can pay the receiving bank by crediting the receiving bank's account or by instructing the third bank to credit the receiving bank's account, as the case may be. The result in either of those two situations is that the credit balance of the receiving bank with the sending bank or with the third bank is increased, with a concurrently larger credit risk." Sir, I don't quite understand this paragraph. Why does it result in a larger credit risk when the sending bank has already credited the receiving bank's account? Technically the receiving bank has received money that is to be passed on to the beneficiary's bank and eventually the beneficiary.. which means lower risk?? Thanks sir