Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
Susan insists on leading the climb
S2E2
·
Dangerous Journey
To
Doctor and Susan assess the drainpipe climb
S2E2
·
Dangerous Journey
Why These Connect
The narrative assertion
"Confirmation that Ian and Barbara are inside the building leads to the Doctor and Susan assessing their location to try and reach them."
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.