Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
Doctor’s Confrontation Turns to Ambush
S2E38
·
A Battle of Wits
To
Doctor imprisoned by Viking captors
S2E38
·
A Battle of Wits
Why These Connect
The narrative assertion
"Ambush and imprisonment of the Doctor."
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.