Replying...
Intro. Frisk was entering the courtroom once again with the same blood-stained knife. Frisk was out of humor with that, she was discouraged, no determination, and Chara just controlled Frisk's body, making it clear that it was mandatory that she had to end the genocidal route once again. But Frisk this time tried to fight against Chara's control and went slowly until she controlled her arm by heating up and used it to hurt herself, tearing her own arm so starting to try to commit suicide right there to reset the world and give a chance to monsters from the Underdark to take their peace and joy back.

Frisk and Chara (Frisk did something tricky for the sake of the monsters)

@João Mateus (Undertale)