Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
Signal through but bomb deactivated
S19E20
·
Earthshock Part 2
To
Cyber Leader vows to purge traitor
S19E20
·
Earthshock Part 2
Why These Connect
The narrative assertion
"The Cyberman Leader expressing disbelief that the bomb has been deactivated (beat_007d25eba21992de) directly leads to the Cyberman revealing that a traitor aided their plan (beat_de5fe2101415ee77), deepening the mistrust and driving the Cybermen's determination to find the perpetrator."
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.