Submitted by verc1ngetor1x t3_127kawv in movies
If the point of the quest was to summon the ghost army and the sword of Isildur was the catalyst for that quest, why did the ghost king refuse to follow Aragorn after it was clear he was the King of Gondor? The build up was fine imo and it was weird when the ghost king decided to say yes because the trio had survived an avalanche of skulls. It makes it seem like the ghosts had encountered others who had a weapon to counter their ghost weapons but didnt make it out of the bone avalanche. I'm referring to the Extended Edition here.
SailingBroat t1_jeeh5g9 wrote
I think the Ghost King's people have always had beef with the people of Gondor, and at this point their cursed selves have just been stewing in resentment for however many centuries. So, I guess it's just bitterness for their curse (whilst also stubbornly/eventually acknowledging their part in breaking their oath in the first place leading to the curse). So, their resistance to immediately follow Aragorn is just momentary pride/wanting to save face, which then gives way to a desire to 'move on'/be released from the limbo of being stuck in that state.
TL;DR - the Ghost King doesn't want to bend the knee right away out of pride, but ultimately wants to lift the curse so agrees to Aragorn's terms