Just saw this chapter (never played WC2 or BTDP) and it made me think, why are there humans here? I don't see any reference about the Alliance of Lordaeron chasing Gul'dan and Cho'gall here so I thought they might be something else.
Are they actually representing the Nightfallen? Court of Farondis ghosts? Stormheim Vry'kul? Sentinel/Highborne/Priestess ghosts? or are they the Val'sharah Sentinels?
Here's the chapter overview for reference: