Thanks for the criticism, really appreciate it ! The animation was originally just test, but it ended up being longer than what I would consider a test animation to be. There were going to be some other things in the animation that would've conveyed what they were fighting for and some other plot points like how the grey Steve wasn't going full out at the beginning, he wanted to see what "Herobrine" could do (I decided to turn the "Blue Steve" into "Herobrine" halfway through animating since it seemed edgy , and it changed the atmosphere of the animation to a more serious tone). The fight was going to start off light and get more serious, but I ended the animation before it got to that xD.
So to address some of the "Story line" points you made (Although this animation didn't really have much of a "Story line" to begin with ).
At the beginning, "Blue" was pretty much just chilling on the ground since he noticed the Grey Steve's presence, I guess you could say.
Blue had a more cocky attitude in the animation. You can tell that from him raising one eyebrow higher than the other to show interest towards the Grey Steve when Grey flashes an angry look at him. He also gives Grey a sword with a cocky look on his face to show that Grey isn't someone worth fighting against. I didn't add much emotion to Blue since he was bored of the fight, and I focused more on the emotions that Grey was conveying, since he was the one looking for a fight with Blue. The teleportation that Herobrine does was what I thought was a characteristic of him, since he usually teleports in animations or other videos that I've seen him in although it might've not been necessary in response to the kick.
The "Story line" (If you could say that ) was that Herobrine took over the position of Steve and was disguising as him. Grey Steve wants to take back the position of being Steve, and that's pretty much it for the story line. I might've continued the story line more in depth if it hadn't started out as a test animation. The animation wasn't supposed to be a full fledged thing, it was just a way for me to practice some scenes that "could be" in my next big animation.
Also the kick you mentioned, yeah it was pretty bad. I was going to go back and revise it, but since I never finished it, I decided not to. All of the fighting parts in the animation were animated frame by frame, so I spent around 5 hours on a scene that only happens for 3 seconds or so. It was also my first time animating frame by frame rather than heavily depending on transitions and getting used to it, so that I could apply it to another animation that I would be working on which could explain some choppy movements in the animation.
Anyways, thanks for the criticism ! I'm not really that great of an animator, so I've still got a long way to go towards being an above average animator at the very least. I wouldn't have posted this animation if I had to be honest with you, but since people from my live streams were expecting it, and me not having enough content on my channel for the meantime as I go on to animate a bigger project that could take months to animate, I decided to post it and give my viewers some content at the very least.