It's time to rescue Pierce, so once head, head to The Broken Shillelagh to enter Pierce's simulation. When you enter, he is fighting some Saints Flow mascots, so help him out and kill them until you hear a loud scream. Pierce says that you will need more guns, so head upstairs and grab a SMG from the chest.
As you go to collect the shotgun, you'll see what appears to be a giant hand grab onto the balcony. Ignore it for now and go collect the next weapon, a rifle. The last weapon is on the pool deck, and it is a RPG. However, the giant mascot, who is named Paul, shows up and starts attacking. Stay where you picked up the RPG and keep firing it at Paul until a cutscene occurs.
You're now alone, facing off against Paul in the distance, who will toss debris at you. Also, the regular-sized mascots will climb up to the roof where you're at and attack you, so make sure you take them out before they swarm you. When they are gone, fire rockets at Paul and keep doing this alternating normal-sized/Paul exchange until he falls down.
Kinzie finally comes into contact again and says she has a plan for how to defeat Paul. At this time, Pierce will pick you up in the helicopter, so hop inside and start firing on Paul. Keep firing until Paul gets up and then continue until you land on the island with the large statue.
Head inside the statue and you'll now be in control of it. There's one button for attacking and one for blocking, should Paul ever get any attacks off on you. Keep attacking until a button pops up over Paul, which when pressed, will trigger the end of the battle and the mission, as well.
