What literary device is used in Maus's subtitle "My Father Bleeds History"?

In the subtitle to the first part of Maus,
the phrase "My Father Bleeds History" includes a metaphor. In this part of
the biography, Art Speigelman gives the background to his father's, Vladek's, story.
Through interviews, Vladek tells Speigelman the details of his life before he was taken
into concentration camps. Speigelman uses the word "bleeds" as a metaphor to describe
the painful details that Vladek reveals to him. Plus, Vladek who has not been so open
with his son throughout his life, finally opens up to Speigelman and gives him many
details. So, the use of metaphor in the subtitle of the story suggests the nature of the
story that Vladek shares with his son.