Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
Doctor realizes Wrack needs a focus
S20E20
·
Enlightenment Part 4
To
Doctor uncovers Wrack’s power focus
S20E20
·
Enlightenment Part 4
Why These Connect
The narrative assertion
"The Doctor's deduction that Wrack needs a 'focus' drives him to ask Tegan if she received anything from Wrack, which leads to the revelation of the tiara and its ruby. This chain of reasoning is the catalyst for the tiara's destruction and Wrack's failed ritual."
About Causal Connections
A directly causes B. The first event sets forces in motion that produce the second. These are the load-bearing connections of plot—remove one and the story structure collapses.