Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
Romana alone in ruins after Doctor vanishes
S17E1
·
Destiny of the Daleks Part 1
To
Doctor surprised by armed strangers
S17E1
·
Destiny of the Daleks Part 1
Why These Connect
The narrative assertion
"While trapped under debris and temporarily alone, the Doctor reads a book and takes a pill, showing his resilience and rationality. Romana returning to find only his book establishes the force of his disappearance and raises the mystery—logically leading to her exploration and peril."
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.