The fiercest competition facing Garry Wallis isn’t coming from an opposing team but from his fellow teammate, Michael Donofrio. Their feud began in “Lacrosse Face-Off,” and it literally ignites in this sequel, set at a sleep-away camp where the Rockets are participating in a tournament. Although the plot really centers on this inter-team rivalry — and its not-so-subtle messages about dealing with bullies — sports enthusiasts will thrill to the constantly returning action on the playing field. That’s what the Matt Christopher brand is built on, and this second lacrosse title delivers. Accessible for elementary-level readers, the themes and content will be of interest to children into middle school as well. ( )