Follow him and use the blowtorch.
When you are in the vents there will be red bars between you and the thief. Use the blowtorch to cut through them and climb up the ladder. Then go to your right, and do the same thing. Once you end up near the machine where the elevator and escalators work, you will see him again. Once again you have to use the blowtorch on the bars. When you catch him in the air vent chamber, he knocks you away.
Go back right to the vertical shaft, burn through the brown bars, and destroy the A/C control so that he has to move. Go back into the air chamber, across to the spinning fan on the left side, and burn through to Vent B. When he blocks your path, go left onto the dark maintenance ladder. When you catch him, you both fall out into the atrium fountain.
Eddie the snake saves the day, and the cops are waiting for the thief.
There are no coins used on Night watch island.
night watch island
Back Lot Island (April 2013)
When you have to break into the empty store, Gus tells you there is a blowtorch in the manager's office (behind the plaque). Use it on the padlock, then follow the thief when he goes into the ceiling. You can use the blowtorch as you pursue him through the vents.
The password to the scooter is "frost."
FROST
The word is "frost."
You have to chase the crook through the vents and escalator machinery, cutting through the blocking grates with the blowtorch. When you catch him, you both plummet into the atrium fountain, where he is kayoed by Eddie the snake. For the full solution, see the related question below.
The code for the scooter is "FROST."
It is behind the Employee of the Month portrait in the mall office.
When he is in the security cart, Gus will tell you how to get the other scooter (Segway) from the manager's office. Chase him up the left escalator in the atrium and he will crash. When he steals the card and flees through the air vents, follow him by using the blowtorch to burn through the grates (red and brown). You will also have to burn up the A/C control for at least one of the two vents.
You can't find any, and you don't need any.