Narrative Connection
How these two moments in the story relate
Why These Connect
The narrative assertion
"Polo's confiscation of the TARDIS key and Barbara's suspicion of Tegana in E16 directly lead to Ping-Cho's evidence of Tegana's lie in E17."
inferred by llm_cross_episode_character
Why This Matters Across Episodes
The longer arc this connection carries
The TARDIS key confiscation and Barbara's unheeded warnings in E16 create the conditions for Ping-Cho's later confrontation in E17, where she exposes Tegana's lie using the Doctor's discovery of Barbara's handkerchief.
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.