I get a little confused here, the assessment is already paid for when you pay to register for level 2.
If you are referring to the chap that fills out your portfolio, then that is an AW and he can neither pass or fail you.
The AW, the chap that follows the candidate, does not assess, all he does is witness the actions of the stalker and puts questions to him and notes the answers.
The portfolio is then sent to the assessor to make sure your answers tick all the relevent boxes.
He may 'phone you for clarification of anything not quite sufficiently covered in the answers in the portfolio.