Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
Peri convinces Doctor to spare Lang
S21E24
·
The Twin Dilemma Part 2
To
Peri neutralizes Lang and takes control
S21E24
·
The Twin Dilemma Part 2
Why These Connect
The narrative assertion
"Peri's successful persuasion that the Doctor should save Lang leads directly to her retrieving his ID ('revealing his full identity'), as this act follows logically from her invested interest in his welfare."
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.