Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
K9 breaches the lead door for Astra
S16E21
·
The Armageddon Factor Part 1
To
Marshal accuses travelers of spying
S16E21
·
The Armageddon Factor Part 1
Why These Connect
The narrative assertion
"The Doctor's inspection of K-block through the hole burned by K9 reveals Astra trapped inside, which directly leads to the Marshal's abrupt appearance and capture of the Doctor and Romana at gunpoint, as he assumes they are interfering with his control."
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.