The Game design concept takes place where the in building security system would cut off the police tower from the outside, locking the terrorists/voomers and the AD Police staff inside the building. With the people locked inside the tower, the AD Police staff could mobilize and take out the terrorist force on its own turf, while dispatching and deactivating rouge voomers as well.
Small Article on MrTwister and The lastest Vehicle in Design and production. This is an older model but The Current one is to have better feeling to it...