Callback
strong strength
Narrative Connection
How these two moments in the story relate
From
Discovery of the black pools true nature
S13E6
·
Planet of Evil Part 2
To
Doctor warns of interdimensional peril
S13E6
·
Planet of Evil Part 2
Why These Connect
The narrative assertion
"The Doctor and Sarah's investigation of the black pool's no reflection anomaly (beat_84335b04086e6426) is directly recalled when the Doctor explains the planet as a boundary between universes (beat_aef5ebcd8ea9931b), reinforcing the significance of this anomaly as a metaphorical and literal threshold."
About Callback Connections
B explicitly references A. A later moment deliberately echoes an earlier one, creating a sense of narrative completeness and rewarding memory.