Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
Nyssa exposes Mawdryn’s betrayal to the crew
S20E12
·
Mawdryn Undead Part 4
To
Companions revert as time spirals out of control
S20E12
·
Mawdryn Undead Part 4
Why These Connect
The narrative assertion
"Mawdryn's admission that Nyssa and Tegan will die if they leave the ship (Act 3) directly creates the Doctor's impossible choice—offer regenerations to save them or not."
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.