[2019] can we talk about how they can see you and you can't see them?

Originally posted by Taylor Nation Roy: Peeker's advantage maybe? If you were stationary, say holding an angle but the opponent quickly peeked a corner then he will see you a few milliseconds early and that's all what it takes to kill you. Also if you have a low ping and he has a high ping (say 100) then his advantage over you while peeking will get even worse.

It is most likely related to peeker's advantage. In cases like this, it would be helpful to have a video to show what you experienced.