Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
Sven discovers monk’s empty cell
S2E38
·
A Battle of Wits
To
Doctor ambushes Sven in hidden corridor
S2E38
·
A Battle of Wits
Why These Connect
The narrative assertion
"Sven is startled awake and rushes in which allows the Doctor to ambush him."
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.