Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
Doctor exposed as virus carrier saves TARDIS
S15E6
·
The Invisible Enemy Part 2
To
Marius orders emergency brain surgery
S15E6
·
The Invisible Enemy Part 2
Why These Connect
The narrative assertion
"Marius' decision to keep the Doctor under observation based on K9’s detection leads directly to the drastic measure of operating on the Doctor, marking a failure of containment and a turning point toward desperate action."
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.