Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
Sara Defies the Doctor’s Retreat Order
S3E21
·
Destruction of Time
To
Sara’s Final Collapse and the Doctor’s Failure
S3E21
·
Destruction of Time
Why These Connect
The narrative assertion
"The Doctor orders Steven and Sara back to the TARDIS, however they are too late and the time destructor is already having an effect on their aging which causes weakness and Sara collapses and dies."
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.