Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
Doctor strands Peri in desperate escape bid
S21E24
·
The Twin Dilemma Part 2
To
Doctor chases Peri into time stream
S21E24
·
The Twin Dilemma Part 2
Why These Connect
The narrative assertion
"The Doctor's successful sending of Peri back in time allows him to proceed to his own temporal displacement, completing the escape plan but leaving his fate uncertain -- a direct narrative consequence of the modulator's function."
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.