"Protect a witness who's testifying against frank"
An accountant who used to work for frank is going to testify against him and so he's planning to take her out. We need to protect her during the deposition so that she can complete her goal. Head to the Vantage Point where you can watch over the Courthouse.
you will be handily given a sniper rifle and then there will be numerous waves of enemies that you need to take out before they reach the courthouse. You are being assisted by the police, indicated on your screen in this case with green icons. Once you've taken out a few of the enemy, some will begin appearing from the other direction, and the in cars.
As it turns out, you can let a few of the henchmen reach the courthouse without failing the objective.
TIP: Try to change your position so you have a clear shot on the courthouse door i.e. which isn't obscured by the pillar being in the way.
Once you've prevented about a dozen waves of enemies from entering the courthouse, a cut scene will play where Vera will confirm that the deposition was a success.
Reward: G300,000, Respect: 1,217,500
Salut