I dont think Bryant would loose to any high school teams. This story might help to prove that,
http://www.insidelacrosse.com/page.cfm?PageRID=2&news=fdetail&StoryID=155639
They broke the defending DII national champion’s 70 game regular season winning streak. If you followed any lacrosse outside of the great state of TN you might have read about this on a website or 2. And if you think DII stinks then you should look at this. Lemoyne, the defending DII national champions,a team that Bryant beat this year beat Syracuse, a school you may have heard of before, in a preseason scrimmage this year, but it was preseason.
http://www.lax.com/stories/1755 (a link to the article about that)
The other thing that you must consider is that Bryant is coached by Mike Pressler the Duke Coach who was forced to resign and two seasons ago he was the D1 coach of the year. I have trouble believing that a D1 coach of the year would allow his team to loose to any high school team. Just a thought.