That bid was there starting this morning. Brumfield a seller down to 01, was about to offer 1000 at 01 in the pit, then boom 1 bid 10,000, at one point grew to 30,000 throughout the day, was pulled during Greenspan Q&A, then back again afterwards. Was hearing someone trying to unwind that 10yr/Bund spread again. Also, probably related to this, five year was 21 bid 10,000 plus this afternoon and traded 21 7000 times, rest was pulled, then traded down to 18.5 before close. Watch out for those 01's monday morning, the order 1 for about 13,000 was still working after 2pm pit close.
http://www.bloomberg.com/news/markets/bonds.html http://www.reuters.com/financeNewsArticle.jhtml?type=bondsNews&storyID=8579233§ion=investing