The billy goat brothers

"Wait for my brother. He is bigger and much more delicious than I!"

There were three billy goat brothers. Their names were Little Billy, Middle Billy, and Big Billy. They had to cross the bridge  to get the sweet grass on other side. In fact, a mean troll who lived under it disturb them. One day, Little Billy crossed the bridge. Suddenly, a mean troll showed up. The billy could escape from him by saying " Wait for my brother. He is bigger and much more delicious than I!".
Next, Middle Billy crossed the bridge. He said same word and could escape from the mean troll. Finally, Big Billy crossed there.

Did he survive?
Could he run away?