Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
Doctor confirms Clegg’s psychic abilities
S11E21
·
Planet of the Spiders Part 1
To
Infiltrating the retreat through deception
S11E21
·
Planet of the Spiders Part 1
Why These Connect
The narrative assertion
"The Doctor's initial assessment of Professor Clegg's telepathic abilities in the UNIT lab directly drives the latter's involvement in the Metebelis Three crystal's discovery and the fatal psychic disturbance."
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.