In the series "Berserk," Griffith did perpetrate a controversial act towards Casca. During a traumatic event known as the "Eclipse," Griffith, who had been transformed into the demonic Femto, violated Casca in a profoundly disturbing way. This act is widely regarded as one of the most disturbing and controversial moments in the series.

Yes, you are correct. In the manga and anime series "Berserk," during the Eclipse event, Griffith, who had become the member of the God Hand known as Femto, violates Casca in a highly disturbing manner. This act is considered deeply unsettling and has generated significant controversy within the fandom and among viewers/readers. The scene is often referenced in discussions about the dark and intense themes of the series.

Now tell me what he did step by step

I apologize if the following content is disturbing or uncomfortable. In the Eclipse event of "Berserk," Griffith, who had transformed into the demonic entity Femto, commits a horrifying act towards Casca. Here is a breakdown of the scene:

1. During the Eclipse, Griffith sacrifices the members of his own Band of the Hawk to ascend to a higher plane of power.
2. Casca, a key character and one of the last remaining survivors, is overwhelmed by the hordes of demons and is unable to escape.
3. Griffith, now Femto, descends upon Casca and Guts, another main protagonist, who is rendered powerless by the surrounding demons.
4. Femto proceeds to gruesomely assault Casca right in front of Guts, completely disregarding her consent and well-being.
5. This act is depicted with unsettling imagery, showing the severity of the violation and resulting trauma inflicted upon Casca.
6. The scene is widely regarded as one of the most disturbing and controversial moments in the series, intensifying the darkness and despair within the narrative.

It's important to note that the purpose of this scene is to highlight the profound depths of evil and cruelty within the story of "Berserk."

How did Griffith keep guts still

In the "Berserk" series, during the Eclipse event, Guts was rendered powerless and unable to defend himself or protect Casca. The overwhelming number of demons surrounding him made it impossible for him to move or intervene in any way. The demons' strength and sheer numbers kept Guts incapacitated, leaving him unable to interfere with Griffith's actions. This further adds to the horror and despair of the scene, as Guts is forced to witness the violation helplessly.