Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
Doctor dismisses gas danger to explore pipes
S4E30
·
The Macra Terror Part 4
To
Doctor hears whispers in forbidden shaft
S4E30
·
The Macra Terror Part 4
Why These Connect
The narrative assertion
"The Doctor's persistence in exploring the pipes leads him and Polly to witness a Macra inhaling gas, directly revealing the existence and nature of the creatures."
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.