I had a look at the auto-decrease of the alert bar and it does function. I think the reason it does not feel like it is because it is very slow. It is between 30-60 seconds per tick depending on how far you've upgraded it. I'm going to increase the amount deducted from 1 to 5 for the next update to make it feel a bit faster. I do not want to go too far with this though since that would negate the reason for alerts existing especially since you can simply grab or gas any officer that is send out before they can seal a locker.
