That's not curving as such, that's as explained in my edit, bad latency causing the hit box to lag behind the character so the character is behind the wall but the hit box is still visible.
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That doesn't make for a very stable PvP game. This happens a lot more than it should.
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Yes I know it should, I do agree dedicated servers are a necessity right now. It needs to happen.
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Now this is the best thing you have said regards this game. Lag is fundamental.