Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
Time Lord uncovers hidden alien invasion
S19E13
·
The Visitation Part 1
To
Doctor and Nyssa confront hidden cellar secrets
S19E13
·
The Visitation Part 1
Why These Connect
The narrative assertion
"Mace's mention of a comet sighting (Barn) is directly linked to the Doctor and Nyssa's investigation of a bricked-up wall in the Cellar (Act 2). The comet symbolizes celestial anomaly, mirroring the Doctor's discovery of hidden alien activity behind the wall."
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.