Self destruct...that is not a good thing and Lan Wangji is quick to get away, making sure to collect anyone else that might be lingering around. It doesn't matter if they are voidtreker, native or whatever...no one needs to be around a bird that is going to explode.

He is going with the belief that those more used to dealing with such things know that this is truly going to happen. Because he would much rather be dealing some final blows to make sure things end. But he wants to live through this encounter so he will find some sort of cover behind a large rock and hope it is enough.