Blinkers are able to teleport short distances as to catch up to the player, similarly to Phasing Zombies from Moon. They can be easily identified as they have an unique blue exosuit (purple in Descent).
Blinkers teleport randomly towards the player. This is especially dangerous if one is dying as it is able to quickly reach the player and attack them. Killing them at distance is the best way to deal with them, as they will be less likely to dodge the player.