Once you arrive at the house of the lawyer there is nothing holding you back from going through the front door and shooting and killing your way to the lawyer, but you might also consider there are less deadly ways to enter that building. Like from the sewers, from one of the other sides of the house - or the rooftop. Each entry point has its own advantages but might also have disadvantages. You can use your superjump or teleport powers to travel over the rooftops. Sneak around to avoid the guards and pickpocket one of them for the key to the lawyer’s room. Then, you could peek through the keyhole and quietly open the door, freeze time, sprint to the lawyer, unfreeze time, kill him and jump out of the window. Or you could just assassinate the guard, take the key, open the door and shoot, maim and kill everybody in the room. And for those with a more pacifist nature there is also the option not to kill him if that is more fitting to your style.