Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
Yartek’s reckless activation triggers explosion
S1E26
·
The Keys of Marinus
To
The Doctor’s Legacy for Sabetha
S1E26
·
The Keys of Marinus
Why These Connect
The narrative assertion
"Yartek putting the fake key in the machine causes the building to collapse, which leads into the doctor speaking with Sabetha about her father."
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.