class MyMod : Script
{
	bool checkOnGround = false;
	Vector3 originalRotation;

    public MyMod()
    {
        KeyUp += MyMod_KeyUp;
        Tick += MyMod_Tick;
    }

	private void MyMod_KeyUp(object sender, KeyEventArgs e)
	{
		if (e.KeyCode == Keys.T)
		{
            //your other code
			originalRotation = Game.Player.Character.Rotation;
			checkOnGround = true;
		}
	}

	private void MyMod_Tick(object sender, System.EventArgs e)
	{
		if (checkOnGround && Game.Player.Character.HeightAboveGround < 0.1f) //touching ground
		{
			//do stuff with originalRotation variable
			checkOnGround = false;
		}
	}
}