Labor won't be covered by warranty. Shimano's warranty is for defects in materials and worksmanship, not labor, although the shop may have their own warranty on labor.
Even so, listening to your story I'd suspect a bent derailleur hanger from shipping the bike to and from the events you attended led to the derailleur getting caught in the spokes. Once you shifted to the large cog, it caught and then ripped it off the bike. You realized there was a problem with the bike, yet continued to ride it without getting it checked out. I don't see how that is a defect in materials or worksmanship.
__________________
Originally Posted by
ahsposo
Ski, bike and wish I was gay.