I like that idea! The ability to walk up walls will allow for more strategic placement of cameras, as well as making it hard to shoot them. It would also make things difficult for the defenders by walking them up and around the hostage!
In terms of the passive ability, would the operator have to be in earshot of the drone for the beep to be heard? Or would it be something that they can hear across the map? And would each drone have a different beep so you can determine which drone detected the movement?
In terms of the passive ability, would the operator have to be in earshot of the drone for the beep to be heard? Or would it be something that they can hear across the map? And would each drone have a different beep so you can determine which drone detected the movement?