I don’t know who Mezio is, but if you’re referring to Moize Opel, I learned from him as I learned from Unreal’s docs. If your system looks similar to mine, and mine looks similar to his, I’m guessing it’s cos there are some coding mechanisms that designers are instinctively drawn to, especially when it comes to conditional mechanisms (Ifs, Dos, Switches, Selects and so on). When I started out, I looked up tutorials and resources for anything related to combat systems in Unreal, and I even sent emails to some people I thought could tutor me, but in the end, I went at it alone and after a few weeks, I was glad I did, cos it wasn’t difficult for me in the first place.