Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
Tancredi loses control during interrogation
S17E7
·
City of Death Part 3
To
Tancredi’s fractured revelation in the TARDIS
S17E7
·
City of Death Part 3
Why These Connect
The narrative assertion
"Tancredi's ominous declaration 'The centuries that divide me shall be undone', observed by the Doctor from the TARDIS, becomes a key thematic and plot pivot that the Doctor acts upon upon returning to 1979."
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.