I think this is pretty straightforward, if not entirely understood (which I think is the point).
Some entity is in the center. It's probably dangerous to humanity. For whatever reason, placing gloves in a rough circle around the entity prevents it from escaping that area and limits its actions. It's probably a symbolic ritual connecting gloves with hands. Gloves contain hands, or cover hands, something to that effect. It's a ritual to seal something away.
The entity kills people that have knowledge of it or of its containment, so that's anyone that has pryed into the nature of the job and come to some correct conclusion, which happens several times in this arc. I thought this happened regardless of distance because of the two supervisors that got killed, but they were only 15 minutes away from the containment area, which may have just been within range. If it had unlimited range, you'd think the old man would be killed since he has more knowledge than any of the gray workers could have come up with. The range may scale with the amount of knowledge you have of it. Which is why more complete knowledge of the entity wasn't passed down.
The entity kills people that it catches intentionally aiding in its containment. Appearing to place the gloves intentionally is what triggers this behavior. That's why you need to drop them nonchalantly as though it was an accident. This only happens nearby, in and around the containment area.
Anyone moving a dropped glove causes the entity to kill the individual that placed it. Not the person who moved it. We see this twice, the first guy accepts a dropped glove from a passerby and is killed, while the passerby is not. I think accepting the glove back is what triggered the death, and he would have been fine if he denied that he dropped it.
And at the beginning of this chapter, an old man is picking up many gloves to clean up the street. It looks like he's going to be killed because we see the finger from below, but we don't actually see it over him. Instead, in the next panel, we see it kill a gray worker who didn't seem to do anything wrong. I think the old man picking up multiple gloves weakened the seal allowed the entity to kill the guy that dropped them without him having to accept them back. This effect also only happens near the containment area.
Very esoteric, but not too incomprehensible if you accept that some parts of it aren't meant to be understood.
so is it safe for the gloves to move after job is done? it's inevitable after all. like maybe having someone return it make more sense but we saw a man picked it up as trash and the guy who dropped it died
Yes, and like I mentioned here, I think it's based on range. It could also be time-based.
The strange face saying "You Idiot" just before the guys started taking photos might be the entity. This story reminds me of 2 things. First is the Ura Baito arc with the kid playing around with a strange doll, in which their actions seem to be projected onto the town the girls were working at. Second is the manga called Kazoku Taikou Satsuriku Gassen, those who've read it will know what I'm talking about.
The weird face was the guy taking a selfie. You can see his peace sign, common selfie behavior. His face is weird because the artist loves that shit, and it's probably the photo setting, like fish eye or something. The person saying "You idiot" was the guy next to him.