"Dirty Duncan" and "Shiny Schultz" are ways to remember the presentation of the placenta. Duncans are called "dirty" because they come out messily, with trailing membranes, and a good amount of blood. Shultz are shiny because the fetal side comes out first, with the maternal side, blood and any clots wrapped up neatly in the membranes. Duncan placentas are usually because the placenta was low-lying. Low-lying placentas tend to be followed with a good amount of bleeding after, and because it was low-lying, the usual massage etc., may not work.
IME, those dirty Duncans often need a shot of pit to control bleeding, more so than the Shultz, but not enough for me to routinely administer pit, but enough for me to make sure I know where it is right away.
So, maybe your midwife eyeballed the amount of blood coming after the placenta and just wasn't comfortable with it.