Unicorn Bug

On November 16th, I recieved the quest to take care of the injured unicorn. I learned that you had to take care of it for severel hours, otherwise it would run away or die. Knowing this, I waited for the unicorn to heal. Finally (after about 8 eights or so) the progress bar for the unicorn was completely filled with green, but nothing happened. This was my first quest so I'm not entirely sure if this is a bug, or just something I am not doing correctly. I took screen shots to prove that it is full, incase the unicorn disappears when I log off. Please help! Thank you!