Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
Master flees to hidden TARDIS
S19E4
·
Castrovalva Part 4
To
Companions flee Castrovalva as town collapses
S19E4
·
Castrovalva Part 4
Why These Connect
The narrative assertion
"The Master's escape and the beginning of Castrovalva's collapse (beat_fab0f04ed7d321a0) force the Doctor and companions to seek an escape route (beat_50e15992875c39a3), driving the climax of the story."
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.