Trying to delete an object after a set ammount of time

Hi, i'm trying to delete an object after some time using schedules to simulate a punch, but it's not working, the hitbox appears after the keypress, but the object won't dissapear after 500 ms.

function playerGolem::punch(%this)
{
	%hit= new sceneObject()
	{
		SceneLayer   = "1";
		SceneGroup = "2";		
		CollisionCallback = true;
		size = "1 1";
		Class="playerPunch";
	};
	
	%hit.setBodyType( dynamic );
	
	%hit.createPolygonBoxCollisionShape(1,1);
	
	%hit.Position = playerGolem.getPosition();
	
	%hit.setCollisionGroups(3, 31); 
	
	%hit.setCollisionLayers(3);
	
	if (strcmp("down",playerGolem.facing)==0)
	{
		%hit.LinearVelocity="0 -10";
	}
	if (strcmp("up",playerGolem.facing)==0)
	{
		%hit.LinearVelocity="0 10";
	}
	if (strcmp("right",playerGolem.facing)==0)
	{
		%hit.LinearVelocity="10 0";
	}
	if (strcmp("left",playerGolem.facing)==0)
	{
		%hit.LinearVelocity="-10 0";
	}
	
	myScene.add(%hit);
	
	//falta borrarlo
	schedule(500,deletePunch);
}

function playerPunch::deletePunch(%this)
{
	%this.owner.safeDelete();
}