Card Rulings:Chronodragon Nextage (V Series)

You still need to ride a grade 3 from your soul as [Rest] at the end of your turn, but if you do not have a grade 3 in your soul, the grade 3 you rode using Chronodragon Nextage's skill will remain as your vanguard.
 * What happens at the end of the turn in which I used Chronodragon Nextage's skill to ride a grade 3 from my soul as [Stand]?