Issue with Calculating Perpendicular Distance in NetLogo

Question

I'm working on a NetLogo model where I'm trying to connect new "call" turtles to the closest edge defined by two "node" turtles in a network. To achieve this, I'm using the perpendicular-distance function to calculate the perpendicular distance from a call to a line defined by two nodes. However, I'm encountering an issue with the implementation. Below is my dummy code, the attempted solution, and the explanation of the problem:

breed [nodes node]
breed [calls call]

to setup
  clear-all
  create-nodes 15 [
    setxy random-xcor random-ycor
    set color gray
  ]
  
  ask nodes [
    create-links-with nodes [
      set color gray
    ]
  ]
  
  create-calls 5 [
    setxy random-xcor random-ycor
  ]
  
  reset-ticks
end

to-report perpendicular-distance [point node1 node2]
  ; Calculate the perpendicular distance from a point to a line defined by two nodes
  let line-vector node2 - node1
  let point-to-node1 point - node1
  let projection (point-to-node1 * line-vector) / (line-vector * line-vector)
  let projected-point node1 + (projection * line-vector)
  report distance point projected-point
end

to connect-calls
  ask calls [
    let closest-edge nobody
    let min-distance 99999

    ask links [
      let start-node end1
      let end-node end2
      let perpendicular-dist [perpendicular-distance myself start-node end-node]

      if perpendicular-dist < min-distance [
        set min-distance perpendicular-dist
        set closest-edge self
      ]
    ]

    if closest-edge != nobody [
      let node-start-point-closest-edge end1
      let node-end-point-closest-edge end2

      ask node-start-point-closest-edge [
        create-link-with node-end-point-closest-edge [set color blue]
      ]
    ]
  ]
end

Attempted Solution:

I tried using the perpendicular-distance function to calculate the perpendicular distance between a call and a line defined by two nodes. However, I encountered issues with the implementation. Specifically, I noticed that I cannot use perpendicular-distance within the context of a link, as it should be used within the context of a turtle. As a result, the code doesn't work as expected.

Question:

How to correctly calculate the perpendicular distance between a call and a line defined by two nodes in NetLogo? How should I adjust my code to properly use the perpendicular-distance function within the context of a turtle?