Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
Doctor learns Eye of Harmony secrets
S14E12
·
The Deadly Assassin Part 4
To
Master awakens Rassilon's star
S14E12
·
The Deadly Assassin Part 4
Why These Connect
The narrative assertion
"Engin’s exposition about the Eye of Harmony and the Great Key directly enables the Doctor to recognize the danger when the Master inserts the Great Rod into the dais. The Doctor's understanding of ancient technology from the transgram allows him to act with urgency in the climax."
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.