I'm watching Harry Potter and the Order of the Phoenix and the Christmas scene just showed. Harry meets up with Sirius in the Black family tree room. While Sirius explains the blast marks throughout the tapestry, the camera pans across the name "Phineas", which is blown off the family tree.
Phineas Nigellus is the only "Phineas" in the Potter books -- why would Phineas be blasted off the Black family tree? I realize I am crossing canon sources -- the movie versus the novel -- in search of an answer, but I'm surprised at the thought of Phineas being removed from the family tree. In the novel Harry Potter and the Order of the Phoenix, Phineas Nigellus is portrayed as ideal Black. He's prejudiced against Muggles and "Mudbloods"; he supports the enslavement of House Elves; he is a former Headmaster of Hogwarts; he is a Slytherin.
Q: Is there anything in Harry Potter and the Order of the Phoenix that would explain why Phineas Nigellus might possibly be blasted off the Black family tree? An answer based in canon is preferred but barring a direct quote, an answer made in the spirit of canon is acceptable as well.