Once O'Connor saw Sheyan diving to the side, he understood his perilous situation. However, he was only a support lacking in both physique and agility, hence he couldn't react with quick agility. Hence, not even half a step later, his legs immediately felt numb, he got shot.
In the nightmare realm where danger lurks in every corner, everyone would have their own emergency contingencies. O'Connor was no exception. He calmly waved his cane as a glass like protective screen appeared over him like a glass room.
This was O'Connor's equipment ability: Glass box! During its duration, it will lessen all damages!