be on guard duty meaning in English

担负警卫任务

I ' ll be on guard duty , okay
我给你把风，好吗？
It is already twelve o clock , and i am supposed to be on guard duty at the main hall at one o clock . if master is still talking , how can i stand up right before her and find my way through the tightly packed fellow initiates to go downhill
现在已经12点了，我1点钟要到前面大殿当护法，如果等一下师父开示到一半，我要怎么从师父的前面站起，然后穿越重重的同修下山呢？