Let me put this in simple words for those who do not understand.
If one of the main hydraulic pumps fails there is an automatic valve which opens to supply both systems from the good pump.
This is intended to temporarily minimise the effect of a sudden failure, extended use can cause the good pump to overheat and raise an alarm. They carried out the correct action which is to disable the transfer valve and allow the good pump to cool down.
They did NOT have a double failure, they had a single failed system plus an overheat warning from the good system.
Just follow the actions in the QRH (Quick Reference Handbook) and all is well. This is a simple proceedure which they are trained to follow, no great drama just a routine failure of a single system.
Having followed the correct procedure they were left with a single failure and it was perfectly safe to stooge around for a while burning off enough fuel to ensure a safe landing below the maximum landing weight.
Job done, full marks.