In Ashton's office, there are at least 10 monitors that are displaying numerous scenes.
Each monitor is displaying at least 10 participants, allowing him to see what is going on with their current situation. Each display is a real-time recording and it automatically switches to each participant.
Ashton had been observing everything since the start of the final trial. So far, only a few people caught his eye and one of them was the Justin and Doug pair.
Their perspective was starkly different from what the other participants had. Instead of showing them on the way towards the Outposts stationed at the edges of Last Bastion's territory, they were going somewhere else different which made their perspective stand out to him.
Then, he witnessed Justin claiming that sword. Which really made him interested in the young man even more.
"...if my memory serves me well, that sword is the Heavenly Punishment Sword, wielded by the Lightning Sword Hero — Alexis."