I think it's because (or the cause of) that the NPC hasn't said what he/she was meant to say next, instead, it just stopped.

I am not aware of Neave having anything else to say at that point of the conversation. It is correct that her last line in this part of the conversation would read 'Please do this small exercise and let me know when you are ready to continue.'

The correct steps (as tested today) to pass here are as follows:

- Drop the ore
- Pick up the ore
- Left-click Neave to select her again (this is important, since picking up the ore will have de-selected which npc you were talking to)
- In the NPC communication box, type the phrase 'I am ready to continue'

This should trigger the next response for this tutorial.