Did you use the BP like I’ve posted it above? If yes did you set up values for the second curve (Speed)? To specify scale and speed you have to doubleclick on the timeline and add 2 curves (one vector, one float). You have to add a start value at 0.0 time (scale 1.0) and some other at the time it should take to minimize (for example 0.1 at 4 seconds). You could even add an external curve instead editing the curve in the timeline node.