An SSH tunnel via multiple hops | ssh -D9999 username@example.com | ssh -L 9999:host2:1234 -N host1

By OK - 
# First, open the tunnel
ssh -L 1234:remote2:22 -p 45678 user1@remote1
# Then, use the tunnel to copy the file directly from remote2
scp -P 1234 user2@localhost:file .

 Note that you connect as user2@localhost in the actual scp command, because it is on port 1234 on localhost that the first ssh instance is listening to forward connections to remote2. Note also that you don't need to run the first command for every subsequent file copy; you can simply leave it running.

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