Depends on how u use the ultimate for the footstep sound effect to occur. Most of the time if u aim down or tele land straight, u will not hear the footsteps. If you use the ultimate and you land somewhat into the ground while u are still running or stuck you will hear the footsteps. Also when you use ultimate with a defuse kit equipped or secondary, that piece of equipment you are carrying is not invisible so people can see you. I am not sure if thats the way its suppose to be, but just letting you know.