Blink is a unique effect shared by Riddler's Staff and Mother Box. They have a chance to "blink" against enemy special 1 and 2 respectively, causing the user to disappear from the battle for the duration of the special and not receiving any damage or effect from it. However, damage over time that is already running before the special will continue to deal damage (unlike Invulnerability). Blink will cleanse a stun even against a very short special.
Batman/Dawn of Justice and The Flash/Wally West Rebirth have passives effects that are very similar to blink, except theirs work against both specials, and do not take effect if they are stunned.
While under the effects of Blink, enemy Raven/Prime's passive is not triggered; her health threshold can be reached due to DOT. However, it would be immediately triggered by said DOT once Blink ends. For the purpose of her passive, Martian Manhunter's SP1, and the first three hits of Raven/Teen Titans's SP2, act as a Blink.