I rarely see a crow around here. But in the summer months I love having the purple Martins around. They sound the alarm when hawks are nearby. . and I've seen them flock together and chase them away.
Nope. . not legally your not. They are protected.
It did not appreciate you trying to take its lunch. 😔
I doubt it's going to try and attack a human that is not standing between it and it's food. . but nevertheless I would be wanting to do away with it as well.