You see these animations everywhere and its where for an instance, you hold out a brief case and when you press an animation plays where you character opens the brief case, so are these animations somehow animated together like tool + player or does series of events happen at right time to make it look like its scripted with the tool together or what
i believe they use KeyframeMarkers
you can add them in the animation editor and then use AnimationTrack:GetMarkerReachedSignal("marker name here") to do whatever
on an unrelated note, i just realised this post was 3 years ago
weird how i found it so quickly from scrolling but ok