This is like an RPG escort mission, the people we've to escort just runs away when we try to do it.
Guts is having problems as he has left his rage behind only to make that rage into an entity itself.
That's why it's important Farneze and Ishidoro and Serpico go along. Make Farneze watch Casca while Guts and Serpico confront threats, and Ishidoro does... Whatever he does. Throw rocks at people. @mbuuqw
This makes me wonder what would happen if Guts could use the Behelit. Would he sacrifice Caska to fulfill his wish, which is most likely to kill Griffith?