Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
The Doctor explains the fourth dimension trap
S2E26
·
The Space Museum
To
Barbara senses the timeline fracture
S2E26
·
The Space Museum
Why These Connect
The narrative assertion
"The Doctor describes their peril, then Barbara senses a shift in the timeline that puts them in immediate danger of becoming exhibits."
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.