Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
UNIT delivers the unconscious stranger
S7E1
·
Spearhead from Space Part 1
To
Henderson discovers the Doctor’s alien heart
S7E1
·
Spearhead from Space Part 1
Why These Connect
The narrative assertion
"The Doctor's presence in the hospital leads to the discovery of his unusual heart structure through x-rays, raising initial suspicions about his identity."
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.