The first step was simple. August created a "domain."
Domains were a power that not many actually used, since controlling the space could be done without them once people got to a certain level of power.
For 3rd class, however, it was very helpful. Their senses were heightened, their maneuverability was heightened, and most importantly, their enemies would be trapped in a limited range.
A third class practitioner didn't have nearly the range of those above them. More specifically when pertaining to this battle, a spatial practitioner was in their element when they had space.
August made sure that Terion could only move within the space he provided. That meant that even if his movements weren't telegraphed anymore, August could read where he was going.
The creation of the domain was the start of their true battle.