Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
Vicki discovers Barbara missing
S2E16
·
The Web Planet
To
Ian trapped in alien snare
S2E16
·
The Web Planet
Why These Connect
The narrative assertion
"Vicki discovers Barbara is missing, calls out for her and alerting Ian and the Doctor while they are exploring."
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.