How do I save Magician from the turtle?

You'll need to convince the turtle to give up his victim.

Warrior could do it if only he could reach the turtle.

You have to hit the turtle in its face, and not its other end, so you'll need
a sneaky way to go around the turtle to get to the other side.

It's too bad that that rope is dangling from the left side of the screen,
because if it were on the right side, Warrior could climb it to reach the
turtle.

Perhaps there's a way to move that rope to the other side.

Of course there is.  But the first thing you have to do is cut the rope down.