Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
Doctor marvels at Mona Lisa aberrations
S17E5
·
City of Death Part 1
To
Romana discovers the micromeson scanner
S17E5
·
City of Death Part 1
Why These Connect
The narrative assertion
"Catherine's act of helping the Doctor passively transfers the micromeson scanner, which Romana finds in her pocket, directly enabling their deduction about the alien plot."
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.