-John displays great courage by attempting to meet his doppelganger again.He could have been seriously harmed in the process as no one knows what his double is after.
-Overcoming fear, he tries to meet his doppelganger again because he knows there must be a good reason why his doppelganger appears before him.
-His courage pays off when his doppelganger saves Andrea and Kati from the explosion.
p.s - since you didnt give any story to refer at . i'll just refer to the novel ' How I Met Myself'