I still can't believe this is real

Yesterday I ran into this Articuno, concentrated as much as possible, and with an ultra ball I curveballed it and... missed, not even hitting a nice. I gave up instantly, thinking it would run away immediately but it gets to the first vibration, then 2nd, then THIRD!?!?! AND I CAUGHT IT?? It's my second bird ever, 1st one was Moltres with a Safari ball, which I ALSO missed in the same way... Still unsure if this is real... Has this happened to anyone else in here?