The document discusses particle interactions between tachyons (Tachs) and tardyons (Tards) from the perspective of different observers. It explores whether Tachs can exist independently of Tards and the options of Tach emission and absorption. While observers may disagree on details like which particle emitted or absorbed a Tach, conservation is maintained. Tachs are proposed to act as carriers of energy between Tards, with the overall result being the same regardless of the observer's perspective. The document focuses on applying conservation principles to interactions between Tachs and Tards.