one aspect that frustrates me a little in retrospect, at one point during the episode for about 10-20 seconds there was a perfect arb between WS and QM sitting right there. WS bid was i think .2-.3 higher (or more?) than QM offer which could have been a clean $2-300 per 1 WS x 2 QM, and it took a good pause there. it was so unusual i hesitated and watched it go