Grab an inherited subclass script from a GameObject in C#

Hey all,

New to Unity. Trying to make an interaction script that lets actions occur on RaycastHit with a GameObject tagged as "Interactable". The idea is to make a behavior script shell that works thusly:

 using UnityEngine;
 using System.Collections;
 
 public class InteractableBehavior : MonoBehaviour {
 
     // Use this for initialization
     void Start () {        
     }
     
     // Update is called once per frame
     void Update () {        
     }
 
     public void InteractWith(Camera interactor) {    
     }
 
     public void StopInteraction() {    
     }
 }

And is then extended to specify specific behavior:

 using UnityEngine;
 using System.Collections;
 
 public class BlockBehavior : InteractableBehavior {
 
     Camera holder;
 
     bool interactionActive = false;
 
     // Use this for initialization
     void Start () {
     
     }
     
     // Update is called once per frame
     void Update () {
         if(interactionActive) {
             transform.position = holder.transform.position+holder.transform.forward;
         }
     }
 
     public new void InteractWith(Camera interactor) {
         holder = interactor;
         interactionActive = true;
     }
 
     public new void StopInteraction() {
         interactionActive = false;
     }
 }

This way, I can just grab the GameObject from the RaycastHit:

 interactionTarget = hit.transform.gameObject;

do some step

 ????

and call interactionTarget.interactWith(playerCamera) or some equivalent. I'm just not used to C# and grabbing scripts from GameObjects. Essentially I want to specify that I'll be using a script of type "InteractableBehavior" instead of "BoxBehavior", "DialogueBehavior", etc so that the interface can be uniform. Right now I'm trying:

 InteractableBehavior interactionScript = interactionTarget.GetComponent<InteractableBehavior>();

but it's not working. I'm open to suggestions.

Hope this makes sense. Thanks in advance for the help!