Gradual Fan Rotation (Solved)

Hiya, I’m new to blueprints and coding in general. I’m trying to make a turbine gradually rotate only hen the player stands in front of it. So far it does, but it immediately rotates at a set speed. I want it to slowly gain and lose speed instead. So far, here’s my blueprint. I tried to make the speed decay innate (every tick) but I don’t really understand how the RInterpTo thing works.

AH, so I’ve tested your’s exactly and it works if I set Make Rotator to X (Roll). However, it rolls the wrong way, and it glitches out if I try setting it to Y (Pitch).