Causal strong strength

Narrative Connection

How these two moments in the story relate

From

Doctor explains regeneration needs to companions

S19E1 · Castrovalva Part 1

Nyssa and Tegan uncover the Master's trap

S19E1 · Castrovalva Part 1

Why These Connect

The narrative assertion

"Adric’s desperate holographic warning ('He's using me... in a block transfer') plants the first clue about the Master’s programmatic trap. This mysterious clue drives Nyssa and Tegan to interpret the TARDIS’s course as a malign plot, not mere malfunction."

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.