'Upon' or 'over' signifies being spiritually higher, or interior.

(Riferimenti: Apocalypse Revealed 900)

5543. 'If I do not bring him back to you' means if no joining of the intermediary takes place. This is clear from the representation of Benjamin, to whom the one he would bring back refers here, as the intermediary, dealt with in 5411, 5413, 5443, 5539; and from the meaning of 'bringing back' as being joined.