Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
Daleks' extermination order triggers escape
S2E30
·
The Executioners
To
Ian and Vicki discover the trapdoor
S2E30
·
The Executioners
Why These Connect
The narrative assertion
"The need to find Ian and Vicki dictates the need to look for 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.