It sounds like you missed something earlier. When on the beach at Krakatoa, go north to the rock platform. There's a cave to the west. Go there.
Viewing post in The Time Crystals of Cythii (TALP) comments
Got it thank you Garry - Finished it!
Really enjoyed this one. Mapped it too!
Only one niggle that I found but not major - If you dont examine the girl and then give her the bow, come back later and she's not in the location, the hint tells you to examine her, obviously you cant. Other than that, a nice adventure that got me thinking!