Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
Unbelievers uncover deadly truth in tremors
S21E16
·
Planet of Fire Part 2
To
Doctor reveals imminent volcanic devastation
S21E16
·
Planet of Fire Part 2
Why These Connect
The narrative assertion
"The unbelievers' investigation of malfunctioning technology in the Seismic Monitor Chamber (Act 2) directly leads to the Doctor and Turlough's examination of the Trion equipment in the Bunker (Act 3), revealing the deeper purpose of the machinery and its volcanic connection."
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.