"This one is definitely harder than Bodyguard 1, but it is not TOO difficult. There are two survivors to protect, but there are more enemies to shoot, as well as a wider variety. Instead of just zombies and poodles, you have to deal with cultists and Jo zombies too.
To start, always take out the Jo zombies first; there's one in the middle, and one to the left. One of each will respawn in their place, so take those out as well. For the rest of the enemies, again, try to take out multiple ones in one shot. You should worry about the cultists and poodles first, then take out the regular zombies afterward."