The goal he speculated might be to take him and Li Huiyuan to a certain place, to meet a certain person.
Or perhaps this goal could be extended more broadly—these zealots leave a fixed point, like a classroom, at regular intervals to patrol, catching people who, for various reasons, have entered here, and using methods to take them somewhere.
As long as these people are still bound for their destination, struggling a bit doesn't seem to matter.
But if someone shows intent to escape, perhaps they'll take coercive measures.
Lin Yi, through certain actions, almost definitively confirmed the accuracy of his speculation.
The good news is that for now he's relatively safe; he has some time to extract either genuine or false information from the zealot.
The bad news is, the danger awaiting him and Li Huiyuan might be even more severe than anticipated.