Long Chen was ready to attack Wu Xun.
After taking a deep breath, he punched Wu Xun. Wu Xun didn't move even an inch backward after being hit. He looked calm, as if he wasn't affected by the attack even a little bit.
"I did feel your hand. This robe is really useless. If it can't stop me from feeling tickled from this weak attack, there's no way this thing works. It's useless," Wu Xun muttered as he frowned. He took off the robe.
He didn't know that the robe didn't work for him because nor was he a Cultivator, nor did he know the method to activate the robe with his blood.
As for the reason he only felt a light tickle from Long Chen's attack, it's because Long Chen didn't use his Cultivation at all. Long Chen simply attacked like how a mortal would attack. He controlled most of his strength even then.
He knew that if he used all his strength, Wu Xun would fly back and crash on the ground. He didn't want to expose his brute strength in front of Wu Xun.