João focused on improving the stability of the knockback mechanic in the CleverRaven/Cataclysm-DDA repository, addressing a rare crash that occurred when the target position matched the direction position during combat. He analyzed the underlying C++ gameplay logic and applied precise vector math to identify and resolve the edge case, delivering a targeted, low-risk patch that preserved existing gameplay behavior while eliminating the crash path. By leveraging his skills in C++ programming and game development, João enhanced the reliability of the combat system, reduced the crash surface for players, and ensured clear traceability through explicit commit documentation and rationale.