Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
The Doctor entrusts K9 to Romana
S18E20
·
Warrior's Gate Part 4
To
Romance and K9 step into the mirror dimension
S18E20
·
Warrior's Gate Part 4
Why These Connect
The narrative assertion
"The Doctor's entrusting of K9 to Romana directly enables her and Biroc to pass through the mirror into a new dimension, as K9's technical skills become part of their new mission."
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.