Headshot him and run around the pillar to the
right, then turn right and take out the second guard. Go past the next
pillar and turn left to see Maggie standing a bit away from you. Run up to
her for a checkpoint. Keep your HK-5 out.
Run forward into the battle zone and start rolling and strafing
simultaneously to the right and forward. If you do this, every shot the
sniper fires will land right behind you.
Keep going forward, bypassing the
turn to the left, and you’ll see a truck. Once you reach the truck, the
sniper’s gunfire will concentrate on Maggie and not you. Climb onto the
truck and plant an explosive for the second checkpoint.
Roll forward off the truck and over to the box on the left, then open it and
grab the HK-5 ammo. Turn around and run back to Maggie’s position, then
take the turn to the left you previously bypassed.
The truck will blow.
Roll to the end of the branching turn, and you’ll get a cutscene and a
checkpoint. You will likely get shot by the sniper 2+ times on your way
there.
Follow Maggie around the first turn around the crates, but ignore her on the
second and go to the right of the red crate. Run forward out in the open
all the way to the wooden crates with horizontal holes in them.
A
flak-jacketed guard will pop out. Blast him and quickly shoot the fuel
tanks behind him to detonate the door and give you a way out of the
building. Checkpoint.