Here is what i did.
Excalibur Umbra going iinto the crime scene.
Collected all evidence.
Interacted with the Corpus Crewman
Got into the weave --> All right answers
Saw the last stone, wanted to interact with it...
No Prompt to Interact with it. Pressing "left Mouse button" or "X" helped.
Tried it a few times.
What did I do wrong?