TURIN..
Blue will be powered by the Blue standby electric pump
No such animal .. the BLUE ELEC PUMP will keep running if AC1 power is available from the APU when the engines fail. YELLOW ELEC pump is powered from AC2.
A windmilling engine hydraulic pump will provide a reasonable pressure and flow down to about Green Dot speed, enough for flight controls except flaps/slats.
(Caution....from observation in the simulator).