"You should ran away, Kachou!" "I must not forgot it... !"
Are they doing this on purpose? They're fucking up on elementary school level grammar. They can't get simple tenses correct. Unbelievable...
A person whose English ability is worse than that of a small child has no business whatsoever trying to translate something into English.
For those who might be reading my comment but are not at a native English level, here's the correct way to write it:
"You should run away, Kachou!" "I must not forget... !"