Andy was a telecommunication contractor. DG was a telecommunication operator. One day, one of DG's transmission station had suddenly lost its transmission signal and hence the whole DG network was down during midnight. Hence, due to urgency, DG asked Andy to rectify the transmission station within the next 6 hours without negotiation of terms. With considerable effort, Andy managed to bring up the network within 5 hours during odd hours. However, when Andy requested payment from DG for the work that he had done, DG refused to pay Andy, claiming that what Andy provided was a past consideration. Apply an appropriate legal principle and discuss whether Andy has any claim from DG