What do I do once I get back to the librarian's screen?

Hint 1 of 6:

You'll need to open the gate in the moat.

Hint 2 of 6:

The lever next to the bananas will open it.  The only trouble is that those
bananas are blocking the lever.

Hint 3 of 6:

Perhaps you can shoot the bananas down.

Hint 4 of 6:

The catapult (i.e. slingshot) from the last screen will get rid of the
bananas for you.

Hint 5 of 6:

Now have Warrior punch the lever.

Hint 6 of 6:

The shark is your way off this screen.