The stranger was momentarily in shock as his eyes beamed with admiration. His strength was incomparable to those adolescents as their strengths were evidently less than that of an ant. Despite all that, their togetherness and pride masked their lack of strength and many people admired and look up to them dearly.
The stranger in blue felt that his presence imposed a certain sense of pressure on them which resulted in some form of teamwork when they were initially some tension between them.
He realized that if he were to deal with them now, he would have to deal with them as a team as they were now unified as one, working together coherently. Given that he was to kill all of them at once, they would all die together without separation. He let out a loud sigh as he felt very overwhelmed by the mysticality of the incident.