Bird World Doppelganger?!

This is a young wagtail (according to Google) that came to play in my backyard just now. At first, I heard chirping near the bathroom window and peeked out. The slightest noise at that moment made it jump up in surprise, like a gag! My beloved cat is also quite skittish and often has the exact same reaction. Even though it's a wild bird, it felt like we weren't strangers at all. After a while, it then strutted in front of the entrance with a cheerful, light-footed gait. It circled the yard once, went back to the rear, and then started pecking at the ground. I followed it to the back, and it went out onto the slope next to the house. A neighbor's car approached, but it dodged by running sideways. Then, as if playing a trick, it peeked its face at me from behind the threshold, saying 'Boo!!' Immediately after, it returned to the backyard and resumed eating without paying me any mind. When I approached, it kept its distance with quick steps, turned, and went back to its original spot. I wondered if it couldn't fly? and cornered it, but it eventually flew away. It seems it was completely underestimating humans 💦 (⬇Continues a bit further down in the comments⬇)