One of the skills Kent learned during his enlightenment was the Dimensional Reflection Slash.
It allows him to reflect attacks back at the attacker.
However, there is a catch.
The skill depends on two things.
The first is the grade of the skill used by the attacker. If the grade of that skill is lower than Kent's, then it can be reflected.
However, if it's higher than Kent's skill grade, he wouldn't even be able to activate the skill, for he would simply know.
But it's more complicated than that. This is where the second factor comes in.
Aside from the skill grade, the second factor is the attack power behind the skill.
Kent has high attack power, which makes even an Earth-grade skill dangerous in his arsenal. The logic is simple: the higher the attack power, the perilous the skill.
So, in this case, if the attack power behind the opponent's skill is greater than his, then regardless of the skill grade, he wouldn't be able to reflect it back to the attacker.