...!

I think I got it.

Control: Party
Cast: Fawriel: Town Pipe: Trading Post
Control: Fawriel
Get from party these items:
-Pandora's Can
-Snufuss Cloak
-Flashlight
-Dagger

Cast: Town Pipe: Snufuss Lair
Go: Cavern
Go: Left Passage
Go: Left Passage

Now, this is the tricky part...

While grabbing the nearest shiny thing (crystal or orb), Cast Town Pipe and Go back to the Trading Post to rejoin party.

If done simoutaniously, the arrows will just hit air since fawriel grabbed the crystal and warped out before the arrows launched.