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Bruce sent him here as a kid. He had to kill a wolf to prove his alpha status.
Now, standing in front of the criminal he's been chasing, Dick would've thought he'd have to do it again, if not for the pup suckling on Red Hood's breast.
"Who are you?"
"Take a guess, big bird." A gun points at him. "Show me if you are the alpha you once showed B."
And at that moment, Dick knows.
No need for the omega to remove his helmet to show his face or his scent. It's truly him. Back from the grave.