I don't think he was wearing gloves, personally.. What I do see is him peering around the corner before walking away from the elevator in a very strange manner... while looking directly at the camera (he knew where it was maybe?) and fishing something out of the front of his pants - not like a pocket, but way down in front and he also seems to grab his crotch area as he walks, as though it's slipping or he wants to mask the shape of it. Anyway, it's very peculiar, and then he suddenly has this mysterious item in his hand,
As for Warriena being throttled - through his entire rant right before the door slides shut, W says -nothing at all (because, I believe, she could not).. right before he goes spare at her, she says he sounds like a f__got and appears to be kind of joking around, as if she's not taking him seriously while he's getting angrier and angrier. The "f word" seems to send him over the edge into a blind rage.
Those alleging he "told her to leave and she would not" are clearly avoiding the very obvious fact that he was holding her down the whole time. At the end of that rant, right before the balcony door slams, he tells her to "get up" because he's been on top of her, and he admits to tackling her to floor numerous times, to his dad. He rants at her to leave but doesn't let her up..... all the while she's on the floor, she says *nothing* but a couple of throttled sounding single words, he rants for a time, and she is utterly silent (he is choking her) and then he tells her to "get up"... which she doesn't right away, probably out of terror and just being choked hard.
Then she starts screaming her head off. Then we hear the door slam, and then Warriena dies.