I've been running through crucible recently and I have been killed too many times behind cover as well as warlock meleed through freaking walls. WTF bungie
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It's lag. All of us are seeing the same shit, it's not just you. Destiny has been this way for a long time and it's not going to get fixed. Will probably be the same in destiny 2, because nothing is being changed on that front in D2. I think they're going to make it CBMM, but it won't stay that way. Bungie are pushing for competitive play, meaning SBMM will be in full effect sometime down the line. They'll probably change it and deny doing so.