TransformVector in simple terms

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Could someone explain to me as if I was a 4 year old how TransformVector works.
Or perhaps in what situation you would use it?

I was looking for a way to find a point in 3d space that is 900 units ahead of my Entity using its current XLoc YLoc XVel YVel. ZLoc never changes. I would like to do this WITHOUT actually moving the entity, fetching it's quardinants, and then moving it back.

My current experiments give me a point just off of 0,0 .

The documentation and examples (to me) seem pretty lacking in clarity. I'm assuming by the lack of details that I'm just making it much harded than it is.