Connect mesh between two world vectors at runtime?

So I don’t know why this doesn’t work for me…
This is my blueprint - The major difference is that I’m trying to use another actor in the world as the endpoint rather than a line trace from the cursor:

But my result is this:

It looks like the spline is properly going from the head of the chararacter (supposed to be a giant boss) to the “Base” actor, but the mesh (also on the minions for now since they’re the same parent NPC) isn’t being attached properly. Not sure why that would be.