Animated fixed point on Spring SOP

Hi, I am trying to create a springy line with a fixed point that would be animated. In my simple test, I have created a spring from a line sop and animated a fixed point on my spring with a noise function. When the fixed point is animated, the rest of the points on the spring doesn’t really follow or behave like springs.
I am not sure what I am doing wrong. Hope someone can help.

sprint_test.toe (5.4 KB)