Narrative Connection
How these two moments in the story relate
Why These Connect
The narrative assertion
"Polo's seizure of the TARDIS and Tegana's subsequent reinforcement of Polo's distrust (e.g., seizing the key, warning of destruction) directly triggers the Doctor's group's desperate escape attempt, which fails and is revealed during the ambush."
inferred by llm_cross_episode_arc
Why This Matters Across Episodes
The longer arc this connection carries
Polo's direct seizure of the TARDIS (enabled by Tegana's lies in Episode 17) creates a critical crisis point: the Doctor's group is now imprisoned and must resort to riskier tactics, which are exposed during the Mongol ambush in Episode 18.
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.