Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
Zygon Harry seizes the signalling device
S13E2
·
Terror of the Zygons Part 2
To
Sarah kills Zygon replica in barn fall
S13E2
·
Terror of the Zygons Part 2
Why These Connect
The narrative assertion
"Sarah's concern for Harry's well-being after seeing him (who is later revealed to be a Zygon replica) leads her to confront him in the barn, where the replica attacks her with a pitchfork—connecting emotional human concern to the deadly infiltration threat."
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.