The battle for Maynard Island (8)

The battle intensified as Erik darted across the still-changing terrain. He had lost sight of Terra, who seemed hell-bent on preventing him from reaching Vex and Restro, but he was focusing his Hydra's head to track the Vindicator, albeit with disappointing results. 

Because of the ever-changing terrain, he didn't have a clear line of sight of his surroundings, and locating the man turned quite difficult.

Besides, Terra was using his powers in a combination that allowed him to create mud slides and quicksand traps in an environment that was already difficult to traverse, further making Erik's movements on the ground complicated.

<If I fly, will make it obvious I'm searching for Terra.>

Besides, he might be hiding in an alcove for all Erik knew.

Regardless, Erik had to be careful when he found him because he would have just a few moments to kill the guy and finally turn the battle's tides.