Guild Wars 2

Quiet often the enemy becomes only visible in close proximity, which renders most PvP styles useless, when running into foes alone on with a few people.

You should see the enemy in the distance approaching.

This seems to be some foirm of optimization intoduced lately. Supposedly, this is to ensure that you don’t experience low FPS or FPS-drops while you die at the hands of enemies you didn’t see. Also happens in PvE if lots of players are around.