This is an on-rails bit, so you're gunning. You have access to the missiles launcher at the Reaver's front, or the turret on its back which you can switch to either by shifting around with the Right Thumbstick or by pressing the X button. You can also swerve to the side to avoid enemy fire with the Left Thumbstick. As you fly by, keep an eye out for Locust and Troika along the way.
You'll soon come to a firefight between some Locust and Gears. Use the Reaver's missiles to blast the Boomers and Drones on the battlefield, and then look over to the left in preparation for the Brumak that will soon appear there. Blast the Brumak until it falls to trigger a cutscene.
Afterwards, you'll be traveling down a tunnel with Skorge's Hydra in fast pursuit. Remain on the turret, fire into the beast's mouth when it gets close, and swerve out of the way when its missiles are fired. As with the Mulcher and Troika, the turret on the Reaver's back can be cooled down quickly by holding down the RB button.
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Once you're outside, fight off the pursuing enemy Reavers and you will eventually encounter the Hydra again.
Boss Battle - Hydra: When the Hydra grabs your Reaver with one of its claws, aim down at the claw and fire at it until it detaches. You only have a short amount of time to get the claw off before it destroys the Reaver. Remember to cool down the turret by holding the RB button before it overheats.
While the Hydra is pursuing you, swerve to dodge the missiles it fires and shoot at its face with the turret until it speeds up and appears in front of you. At this point, you must hit its face with a missile before it collides with the Reaver. Repeat this pattern and eventually the Hydra will fall.
