Have I got this right? You are displaying a recorded animation in different parts of a room under which you want to project a laser line, that due to the size and duration of the animation at its various display positions in the room requires the laser line to be different lengths and projected for different durations of time.
Sound like you need a time line sequence. That will enable you to create frame sequences of the different length, duration and display position for each of the laser lines then string them together in an overall sequence to match the animation.
Cheers
Colin.
Anyone wanting to be a politician, should automatically be excluded from being one!