I was with a friend one time in their sibling's new home, this was an apartment so I did live in the same area, while my friend (call her B) was living under her sister (A) 's new apartment. Now, these were not very old apartments nor like brand new, how ever, we did live in a bit sketchy place where like at 8 y'all gotta get the kids inside, by 9 lock your house down type of ordeal. So it was liiiiiike what, 5pm when I was over there(?), and we were in her sister's room watching the house while house/apartment sitting.
We had B's dog too, which was this cute fluffy Chihuahua male who loved hanging with gals, was also very protective of them, and remember this part, hates males. He wasn't harmed or anything but he just did not like males in any species what so ever! So as we were sitting there watching so show, and we had the lights off since it wasn't too dark but getting there, and we both noticed how her dog(Pup) was kinda getting a bit, annoyed if u will? Not going off but just, whining into a growl, looking at the open door of the room into the hallway, the apartment wasn't to big but to put it.
If u were where we were, then it'll lead into a short hallway with a door 5 -6 feet away which was the walkway bathroom(the main room we were in had one too but small), then a closet that sat the other side facing to the bathroom, going further down you'd be in the living room, on your right is the kitchen entryway(big archway of an opening) and on your left was a small table for dining of two, to the living room.
So we weren't like freaked but just kinda aware something was bothering Pup, so I just stared kinda talking to B to break tension and see if Pup was just fed up not hearing our voices or something, cause the TV was loud but not like normal loud(ik a lot of detail but they are vivid in my mind) but as I did it felt like Pup was just not even aware we were there anymore he was just staring, getting a bit more growly now at the hallway. So I kinda look, not leaving the bed/B's side, but saw nothing but darkness, Pup was just getting more and more aggravated so I sat up and as I did it just clicked.....like I sensed something was...like shifting the air.....it felt not heavy but like I was light(?) And the air was colder, not icey freezing....
But then B said she doesn't want to be here anymore, I silently make a comment on something is off but what ever IT is It's near the hallway, thee only way out of the room....so me wanting to be the good friend (I'm like a mom friend/I've delt with a few things being a miss in situations like this at this point

And was starting to pick up that this wasn't soothing normal...so stupidly I walked closer to the hallway getting a bit more colder and just feeling from lighter air, to heavy air now..and Pup was close behind me too, I walked down the hallway till we reached the crossroads of kitchen and living room...
Now, I'm not going to lie, idid this part on purpose because I just didn't want to
1) piss whatever IT was off, cause the air I felt wasn't friendly
2) didn't want to be traumatized again(some things have just passed Soo unforgivably terrible...I feel sorrow for them not being able to "rest" properly...
3) maybe actually be a serious real life threatening situation cause God forbid who knows! (Especially now-a-days...)
So I looked into the living room first even tho I knew...I knew the energy was coming more from the kitchen, and I KNEW I'd see nothing there in the living room, but I looked and saw NOTHING!! so looking no to the kitchen, it wasn't even like a solid, threatening, shadow....more of like a black, very see through misty, torso/waist shape(of a male due to hight and build of shoulder due to the available of how much the chest "showed") and it wasn't like ANGRY but just.... depressing, suffocating, sadness (know the feeling too fell...) It just "stood"/"floated" idk but it was there for a few seconds, till it just WHOOSH!! (You can see the full kitchen to the little window a the other end of it since it really wasn't that big of a place) it fucking went out the closed window in the kitchen and gone! Cause I chased it to see it just gone! Not to the ground nothing!
Now also note, these Windows can't freaken open!! They are literally rebuild, yes I say rebuilt, to never open.....I kinda see why not because God.......I really feel bad for that poor soul cause they really weren't like harmful or even angry just really suffocatingly sad....