When Jodie shutted the accidentally opened condenser and the Kazirstan's underwater condenser, Aiden isn't separated from Jodie. Only when Jodie shutted the Black Sun condenser. I think it's because of the Portable Containment Field Belt. When Aiden was separated from Jodie when the Chinese Military caught her and Ryan, I thought of maybe when Jodie was wearing the belt, Aiden is already separated like the scene where the Chinese Military and Jodie passed the containment field doorway. Jodie's belt was malfunctioning right? Maybe that's why she still can use Aiden even if she has the belt. The separation occured when Jodie wore Ryan's belt and when the explosion occured. The belte separated them for a while and the explosion did break the ethereal tether. That's my theory tho.