"Protect one of Goodman's accountants while he attempts to conduct a business transaction"
Warren has an accountant who is having an interview with some unsavory characters that you have to be very careful when dealing with. He wants us to check out the place they are meeting and to make sure nothing untoward happens. Head to the construction site once the cut scene is over to begin.
Once there, you see a sniper on top of the construction site. You need to kill him to continue, so head up the ramp into the site and take him out from behind. You can then pick up his Sniper Rifle. Enter Sniper-Scope mode to trigger the next stage of this mission. There is firstly one sniper, then another two that you need to take out.
the accountant then arrives and you need to keep a watch over him with your scope. Almost instantly, about half a dozen enemies will appear. You need to quickly switch between targets, zooming in and out from one to the next and deal with the enemies. Bear in mind that the enemy is shooting at the nearby vehicle - if it blows up it will kill the accountant as he's hiding behind it, so make sure it doesn't.
Once you've dealt with everyone shooting at the accountant, he'll move away and Warren will confirm that you've completed your objective.
Reward: G200,000, Respect: 890,000