Okey I´ve use this to check when to click for the swing system:

//swing start time swingStartTime = Time.time;

//Click start time comboStartTime = swingStartTime + swingComboDelay;

//Click end time comboEndTime = swingStartTime + swingDuration;

and when the player clicks I just check if the click times was in between comboStartTime and comboEndTime.

Thanks everyone for you help!

you could add an invisible trigger box at the position you want the player to press.

When the player enters the zone you can switch a boolean and switch it back when he exits the zone as well as a late boolean for example.

Then you check if the boolean is true when you press if all true then action. But if the key is pressed and the late boolean is on, meaning you passed the zone, the you fall.

var late:boolean=false;
var inZone:boolean=false;

function OnTriggerEnter(other:Collider){
if(other.gameObject.tag=="jumpingZone")inZone=true;
}
function OnTriggerEnter(other:Collider){
if(other.gameObject.tag=="jumpingZone"){
inZone=false;
late=true;
}

function Update(){
   if(onRope){
      if(Input.GetKeyDown("jump")&&inZone)
         //Good Action
      else if(Input.GetKeyDown("jump")&&late)
         //Falling
   }
}

Above is a simplified version you could start with.