Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
Ian trapped by Dalek magnetism
S1E8
·
The Ambush
To
Doctor abandons Ian to save Thals
S1E8
·
The Ambush
Why These Connect
The narrative assertion
"Ian's insistence on being left behind directly leads the Doctor to persuade Barbara and Susan to board the lift promising to rescue him."
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.