the 220volt appliances or loads...
..remaining on or connected are providing the current path, though resistive, to the dead leg. any 110v load on that (dead) side will be low, slow, dim, etc...
the current will flow through in from the pole on the good 110 leg, through all 220 loads in parallel if more than one (pump, stove, water heater, baseboard heaters, etc) drop in voltage, then flow through 110v loads on that (dead) side, and finally flow out the neutral...
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