Vogler, Memo From the Story Department:
At the end of Act One, the hero commits to leaving the Ordinary World and entering a new region or condition with unfamiliar rules and values.
At this point, the hero should be fully committed to the adventure ahead. He or she will leave the ordinary world and enter into the extraordinary world full of unfamiliar rules and values. Also called the First Plot Point, this moment marks the end of the beginning (Act 1) and brings us into the middle (Act 2) of the story.
Batty - Movies That Move Us:
Physically, the protagonist commits to the journey by Crossing the Threshold into the Special World. By crossing physical barriers or undertaking new physical experiences, he relinquishes the physical complacency and routine of the Ordinary World. and abandons all doubt as to why a new world should not be entered. His commitment to the journey is exemplified by a physical force which changes the course or intensity of the story, giving him the physical challenge of braving the new, unknown world. Upon entering the Special World, he knows that he has been bestowed with the chance to physically change or grow.
Vogler, Memo From the Story Department:
Encouraged or forced by circumstances, the hero crosses an inner Threshold by Committing to Change.
Palmer - http://www.crackingyarns.com.au/2011/04/04/a-new-character-driven-heros-journey-2/
Step 5: Committed (Crossing the First Threshold)
In the previous sequence, the hero weighed up their options. Now, in this last phase of Act 1, they finally commit to the Journey.
In Star Wars, Luke takes up the challenge thrown down by Obi Wan after discovering his Aunt and Uncle have been murdered.
In Little Miss Sunshine, Dwayne agrees to join the trip to Redondo Beach after his mother tells him she will let him apply to flight school.
In The King’s Speech, Bertie listens to the phonograph recording he had previously viewed with derision and is amazed to hear himself speak for the first time without a stammer – making him think that perhaps this Logue character might know what he’s on about after all.
Sometimes the hero wants to commit to the journey but they need to convince a Threshold Guardian to let them go on the “adventure”. Michael Dorsey desperately needs this job on a daytime soap – even if it means dressing up as Dorothy Michaels – but first he’s got to convince the misogynistic director, Ron.