It's the PTP (peer to peer) PVP, he saw himself backstab you, however because your machine was most likely faster (or some othe rlatency issue) you did not see what he saw. To fix this never enter any PVP on any fromSoftware game, unless you have the terrible internet and can take advantage of it.

Players must explore and fight their way through the vast open-world to unite all the shards, restore the Elden Ring, and become Elden Lord. Elden Ring was directed by Hidetaka Miyazaki and made in collaboration with George R. R. Martin. It was developed by FromSoft and published by Bandai Namco. 2.2M Members. 8.5K Online.

Backstabs are the core punish mechanic of the game, It's personally my favourite thing about Dark Souls, the backstab meta game has more depth than anything in the sequels for me. If you're not big on backstab focused gameplay maybe try flip CB which focuses on whiff punish and out spacing your opponent.
A lot of Dark Souls 1 PvP is based around prediction. Whoever accurately predicts what his opponent is doing will be the winner. There are ways to counter every type of backstab, but it is a lot like a game of rock paper scissors. There is also latency, if your enemy starts teleporting around (literally) and sliding then yeah that is a definite

Dark Souls Remastered is an updated version of Dark Souls releasing on May 25th, 2018 for PC, PS4, and Xbox One. It was released for the Nintendo Switch on October 19th, 2018. The updated version of the game features graphical enhancements as well as an expanded online mode.

backstab tech: if your shield is raised, you cannot backstab enemies like in dark souls 3. Riposte has timing, so I would keep practicing until you get it. It took my eyes some adjustment to get it just right when I first booted up the Remaster.

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dark souls backstab not working