Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
Doctor reveals emergency TARDIS key
S2E16
·
The Web Planet
To
Barbara’s Forced Ejection from the TARDIS
S2E16
·
The Web Planet
Why These Connect
The narrative assertion
"Doctor uses the ring to open the doors. This creates the possibility of Barbara being pulled outside of the TARDIS. Setting up the trap for Barbara."
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.