Narrative Connection
How these two moments in the story relate
Why These Connect
The narrative assertion
"Lamont's Zygon infiltration in Part 3 (resulting in McRanald's murder and her own exposure) sets the stage for the Doctor's raid on the Zygon ship in Part 4 to rescue her and the Duke."
inferred by llm_cross_episode_character
Why This Matters Across Episodes
The longer arc this connection carries
Her imposter act directly causes the Doctor's intervention to neutralize Zygon threats, including her own rescue.
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.