It's challenging you to a duel

*mortal konbat music starts playing*

Hes daring you to try something

You're next motherf**ker!

Run. That ain't no ordinary hawk...

I saw this happen in my backyard. It looked like the pigeon exploded... it was incredible.
It was a peregrine falcon and I normally don't like watching animals die, but 10/10 I would watch it again.

You should be asking it for the sidequest.