Causal
medium strength
Narrative Connection
How these two moments in the story relate
From
Ben and Polly’s reluctant tunnel separation
S4E4
·
The Smugglers Part 4
To
Ben rescues Polly from pirate ambush
S4E4
·
The Smugglers Part 4
Why These Connect
The narrative assertion
"As Polly nears the TARDIS, she is ambushed by David and the Spaniard. This would be an obstacle/complication towards her progress."
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.