Noam Liebeskind showed us that if black holes suffer large
kicks at merging, you can't get a tight black-hole-mass vs bulge-mass relation. Liebeskind's technique was monte-carlo on the mass growth through mergers, like a technique that Alice Shapley and I discussed (in Chicago) for analysis of the width of the red-galaxy color–magnitude relation (when you allow
dry merging). But Gruzinov noted that you might get even stronger limits on kicks by looking at the centrality of the black holes, since the relaxation time for an off-center black hole might be long!
Bart Pindor dropped by and discussed lensing with me—or at least he listened when I went on about lensing statistics. He was suspicious that arc statistics could be considered evidence for non-gaussianity.