( The high demon's POV )
The high demons within the demon camp did not patrol.
High demons in general were treated as first-class citizens within the demon world while the common demons were second rate and hence high demons did not participate in repetitive and laborious duties like the common demons did.
This divide between the high demons and common demons was not because the demon society was racist, but simply because the high demons were physically and intellectually much superior than the common demons.
On average they were 4-5 inches taller, much more muscular and had heightened body functions such as a sense of smell and hearing.
And it was because of this heightened sense of smell that the high demon was able to smell-out Ben and Leo from a distance without even seeing them, as unfortunately for Ben and Leo, the wind carried their scent downstream for the demon to smell.
"Oye! Which one of you mongrels is supervising the human slaves? I smell a couple human slaves hiding in that direction–
How can you guys be so irresponsible?
Someone quickly go and capture them! The human slaves are not allowed to loiter in the outer ring" The high demon said, as he pointed towards the direction where he smelled the humans to be, and redirected a few patrolling general demons to check it out.
Since he had only smelled human scent and had not actually seen them, the high demon assumed that it would belong to one of their human slaves who was lost, however, little did he know that it belonged to intruders who were here to take him out.
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( Ben and Leo's POV )
Ben and Leo had no idea about what the demons were talking about internally as all they could hear was a high demon shouting and several small common demons running their way.
"We need to hide. These tents cast long shadows, blend in–" Ben whispered as he saw a lot of demons coming his way, as he and Leo used [ Vanish ] together, as they seamlessly blended into the shadows, making themselves invisible.
"@@@##"
"***@## ##@#"
"@@@###&&&"
The common demons looked all around, often passing from right in front of Ben and Leo, however, they failed to notice them while they were hidden within the shadows.
Since the common demons did not possess smelling abilities as strong as the higher demons, while they could smell the faint scent of humans lingering in the air, without visual evidence to support their noses, they could not single-out Leo and Ben's location.
After a couple minutes, they seemed to give-up on trying to find them, as everyone returned to their original positions, however, it was not until a couple more minutes had passed that their alertness levels dropped back to normal.
"Okay, it's safe to come out–" Ben said, as he deactivated his ability first, and peeked over the corner to look at the high demon, who seemed to be perplexed and agitated.
Since he could not understand demon language, Ben had no idea as to what the demons were talking about internally, which was a huge disadvantage, as without having the facts he found it hard to plan his next move.
Leo, following his master, also came out of hiding and peeked over the other side of the tent towards the high demon, as he waited for Ben's orders on what to do next.
Leo felt his heart beating wildly out of his chest at this moment, as when the common demons were passing from in front of him, Leo genuinely worried about whether or not his skill would be enough to fool their senses or not.
Thankfully, the skills that Ben had taught him were powerful enough to betray the senses of the demons, as even while passing right in front of them, the demons could not perceive them.
'I don't know what's going on, but as long as master is beside me, I guess it's going to be okay' Leo thought to himself, as instead of trying to make sense of the situation, he simply put all his faith behind Ben and just waited for his next instructions.
[ Boy, follow me– ] Ben said through sign language as Leo nodded and followed him closely behind as the two ran from the cover of tents to tents as they closed down the distance between themselves and the high demon.
Then in a move that Leo never saw coming, Ben simply disappeared from beside him and within a blink of his eye, he killed not just the high demon, but around half a dozen common demons, who were all listening to the high demon rant.
'What the–' Leo thought, clearly at a loss of words, as he had never seen anyone move so fast before.
One moment, Ben was beside him and the next he moved at a speed that Leo could not even perceive and managed to kill 7 demons in total in under a second.
The speed at which Ben moved was so fast, that even if Leo had tried to throw daggers at his enemies, Ben would have probably killed them all before a single dagger hit the nearest target to Leo, which was why Leo could not begin to even fathom how Ben did it.
[ Come on, let's keep moving… ] Ben said through sign language, as he urged the gawking Leo to keep up.
As Leo caught up, he noticed an unusual sight of sweat beading on Ben's forehead.
This was highly unusual for the master assassin, whom Leo had never seen break a sweat before, as despite Ben's expression remaining as composed as ever, Leo understood that whatever move Ben had executed had taken a significant toll on him, as the Master Assassin wasn't someone who would break a sweat otherwise.
'Guess I haven't learnt everything that Ben had to teach….. there's at least this one move that he has clearly not taught me–' Leo thought to himself, as he resolved to ask Ben about it once this mission was over.