Helaman 16:1-8 He was Never Heard of More

In his 2008 First Presidency Christmas Devotional talk, President Eyring shared how his family re-enacted Samuel's prophesying of the Savior's coming:

Have someone stand on a chair as if they were on the city wall as they read these verses. When they finish, allow everyone else to toss wadded-up paper at them as if they were throwing stones. Remind them that Samuel cannot be hit.

Why were they unable to hit Samuel? Where did Samuel go? What do you think Samuel did after he fled from the Nephites?