oh what to do

[micko and jack]

hi all back again with another question

i got a fantail hen from a guy who had his hens and cocks in different lofts i tried to pair the hen with a fantail cock after locking them in a nest box for 2 days i let them into the loft the hen keeps going to the nest box but the cock isnt interested a red and white fantail cock got up on the hen ( he has chicks and his hen is on eggs again ) do i

A  JUST LET THEM GET ON WITH IT

B  LOCK THE HEN AND COCK BACK IN THE NEST BOX

C  BRING MY PROBLEMS ELSEWHERE

thanks for any help micko