After the figth between Eren and the bestial titan a flashback takes place in the head of the father has Eren. The secret basement ! The father begins to tell what there is in the basement.
-As you know, I am a doctor and I produce vaccines and I created a vaccines which transforms the men in titan and I introduced this vaccine in some foods. Except that my purpose was not to kill the human race but to save well our race .
Eren begins to become more and more to irritate He thinks again about her mother killed by a Titan
-Dad I to forgive you never !
Eren, mad with rage it transforms into Titan, he ravages everything in his passage, but the bestial Titan return to fight with Eren. A fight redid sice against both titan.
To be continued