Jeb wrote:

HOWEVER,

I suspect this will turn out to be an issue of flying the pattern.

http://www.bradenton.com/mld/bradenton/7735795.htm

Actually, my first instinct was this is not "flying the pattern issue"
but typical high wing vs low wing blind spots. From the artical, both
planes were on downwind.

Sounds from the artical, that the two planes intermingled on downwind,
and just didn't see each other due to the blindspot created by wings.

Allen