The air swirled suddenly, and Amok became visible in Troy’s grasp. He was the same incongruously ancient youth who had appeared before the Council of Lords in Revelstone.
Ahhh ok. The whole point of the 'hurry up and wait,' at Revelwood was to allow Amok to make a dramatic entrance.
If the good guys were serious about fighting Lord Foul's army, they would have arrived. Had their war council (1 hour max) to get the new comms tech, then stripped Revelwood of anyone who could swing a sword or a staff and left.
Just as easy to throw Amok into the mix in a brief war council, and would have made the 'pressing issue of speed,' supposedly motivating everyone believable.
