Zhou Tian did not stop the actions of his bodyguards. Zhou Tian let his enemies approach because he was confident in his power and despised the threat posed by the monsters. If the others truly had any actions up their sleeves, Zhou Tian would block them when the time came.
However, Zhou Tian did not resist their approach because he wanted to fight. He wouldn't warn his subordinates in advance if the enemies had the guts to approach him. But if the enemies couldn't withstand the attack of his bodyguards, Zhou Tian wouldn't have any interest in them.
In short, Zhou Tian adopted a laissez-faire attitude towards the enemy forces. If they attacked him, he would counterattack. If they lacked the ability to attack Zhou Tian, he would simply ignore their approach.
