Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
Tancredi’s fractured revelation in the TARDIS
S17E7
·
City of Death Part 3
To
Doctor senses temporal unraveling
S17E7
·
City of Death Part 3
Why These Connect
The narrative assertion
"The Doctor's observation of Tancredi's deteriorated mental state on the TARDIS causes his grave concern ('centuries being undone'), leading him to return to the Rive Gauche to investigate Romana's whereabouts."
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.