Apparent satellite made right angle turns, zigzaging across sky, then shoots away VERY fast.

Was in Central America with a group of high schoolers on a trip organized by our church doing secular work, building a schrool in a small village. A small group of us were laling on the ground looking up at the stars and spotting the occasional satellite moving across the sky. Some of them would appear to blink, we supposed they were roating. We were tiring and about to get up and go to bed when someone noticed another satellite, but doing something it shouldn't be able to do. It was making sharp right angle turns as it moved in a 'straight' line across the sky. It made maybe 30 or so turns and when it neared the horizon it got very bright and moved off at an oblique angle at an extremely high rate of speed. Hmmmm........ Wow!
Witness indicates that date of sighting is approximate.  PD