Hint
Did you know in co-op mode, if you are in a dangerous area and theres 2 guards talking to eachother, use the 'dive mode' to take them out. This is only affective if you have the aim right or your busted.
Hint
You can use an object to distract guards, this is useful for stealth if any guards are in the way, the object will pull them out the way, but be quick if you gotta get past a light.