Addendum - After The Close
The one thing I hate about stockcharts.com is that even though you are paying for real time quotes, you get indeces after the close, generally about 6p.m.
Looks like all bond markets have sold off hard into the close, which wound up closing below previous closes up to six months prior.
Whomever was trading in GBN.V at the close is literally crap-shooting their investment off the board. The bigger, smarter players never react this way, they wait and let someone else do the work for them.
If you look at previous day's action when bond markets decline, you can see a marked rise in GBN.V, save for today when it GAPPED DOWN.

supersize: http://www.flickr.com/photos/11747277@N07/6980507355/sizes/l/in/photostream/
stockchats.com
-F6