Whether you say last night's episode or not, I can describe the scenario.
Two men tethered together in zero gee.
Man # 1 floats free of any other attachment
Man # 2 has his boots magnetized to the city in space
Man # 2 throws Man # 1, then demagnetizes his own boots so that the force propels them both where they want to go.
I say the city would have absorbed the reaction, leaving no extra energy to propel them both. What do you say?