Action when Face tracking loses it track

You can simulate an object freezing in place by having a second disabled object not on the head binding and using a script like the following: 

//@input SceneObject headObject
//@input SceneObject headObjectWhenFaceLost

var lastLocation;
var lastRotation;
var lastScale;

var transform = script.headObject.getTransform();
var transformWhenFaceLost = script.headObjectWhenFaceLost.getTransform();

var updateEvent = script.createEvent("UpdateEvent");
updateEvent.bind(function (eventData)
{
//record last known location, rotation and scale;
lastLocation = transform.getWorldPosition();
lastRotation = transform.getWorldRotation();
lastScale = transform.getWorldScale();
});

var faceLostEvent = script.createEvent("FaceLostEvent");
faceLostEvent.faceIndex = 0;
faceLostEvent.bind(function (eventData)
{
//show the second object while face is lost
script.headObjectWhenFaceLost.enabled = true;

//set position, rotation, and scale of second object
transformWhenFaceLost.setWorldPosition(lastLocation);
transformWhenFaceLost.setWorldRotation(lastRotation);
transformWhenFaceLost.setWorldScale(lastScale);
});

var faceFoundEvent = script.createEvent("FaceFoundEvent");
faceFoundEvent.faceIndex = 0;
faceFoundEvent.bind(function (eventData)
{
//hide the second object while face is found
script.headObjectWhenFaceLost.enabled = false;
});

thank you martin, Ill give it a try!!