Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
Doctor breaks free on Borusa's cue
S20E4
·
Arc of Infinity Part 4
To
TARDIS materializes above Amsterdam canal
S20E4
·
Arc of Infinity Part 4
Why These Connect
The narrative assertion
"The Doctor’s successful TARDIS departure from Gallifrey (Act 1) leads directly to the Doctor and Nyssa materializing in Amsterdam (Act 2), initiating the physical pursuit of Omega on Earth."
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.