Under these stressfull circumstances, I wouldn't rule that out. Why give $12B and get nothing back, when you can just buy the company and make a profit, and take out one of your future competitors. Because when Lehman Bros. gets out of bankruptcy they'll slowly start accumulating assets again, making money again, and probably go back to competing with Barclay's again one day, in the not so distant future. I think their playing a classic game of chicken right now, or maybe it's "who blinks first?".