Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
Discovery and entry of invisible spaceship
S17E23
·
Shada Part 3
To
Skagra corners through the TARDIS
S17E23
·
Shada Part 3
Why These Connect
The narrative assertion
"Entering the spaceship allows the Doctor and companions to be admitted by Skagra, who has been monitoring their approach. Skagra's admission is an intentional trap, directly enabling the Doctor's isolation."
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.