Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
The Doctor reveals the TARDIS is gone
S2E17
·
The Zarbi
To
TARDIS Tracks and Survival Sacrifice
S2E17
·
The Zarbi
Why These Connect
The narrative assertion
"The loss of the TARDIS prompts the Doctor and Ian to search for it leading to their discovery of tracks in the sand."
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.