How did the Nur transfer?

How did the Nur transfer? 

“Hadhrath Jabir bin Abdullah narrates that the Prophet [s] said ‘Allah [swt] created me and Ali from a nur before the Arsh, we used to perform tasbih and taqdees of Allah [swt] two thousand years before the creation of Adam. When Allah [swt] created Adam [as], He [swt] placed our Nur into his loin, which transferred through a pure lineage, till it went into the loins of Hadhrath Ibrahim [as] and then through his pure lineage it went to the loin of Abdul Muttalib from where , two third went to Abdullah while one third to Abu Talib. Mine and Ali’s Nur then rejoined through Fatima, thus Hasan and Hussain are the two Nur of Allah [swt]”.

[Majlis, Volume 2 page 230 (printed Egypt) by Allamah Abdul Rahman al Safoori].