Kick-tail ending man!  Not going to mention details and be "that guy" who spoils stuff for people.  But man I could totally envison myself as one of the people in the football stadium as the spaceship landed and the 100,000 triangles started attacing the football fans.  FANTASTIC ending!

I was surprised you used "explostion" rather than "emplosion" technology to kill everyone, doesn't blowing up the football stadium carry the risk of flinging triangles out into the parkinglot where thye could crawl into nearby homes and kill people? 

Or is that how the next book starts off?

I'll never view football the same again.