Good post. If people are curious about this effect, it is described in more detail and demonstrated in several super-slow-motion videos here:Actually, squatting the cue ball requires just a tad of forward spin or roll, rather than draw. Because the mass of the stack is greater than that of the cue ball, the CB will want to bounce backward off the stack. So when the CB bounces back towards mid-table that bit of forward roll converts to draw and is what throws out the anchor to make the CB squat rather than continue rolling back up table.
Regards,
Dave