These gangs set a bomb inside the Luigi, if it blow up, the mall will explode. Shoot the Luigi as fast as you can before the gangs will come to you and kill you!

It's a short mission though but very high difficulty. Go on stealth and take these guys out but watch out, they have laser snipers. Use a silence pistol will be the best choice to not alert the snipers.

Zimos will help assist you.

To play the mission, just press 3 + INSERT.