While I very much respect Sam2’s knowledge, I think he is guilty of mixing two unrelated concepts here. The sugya about zugos is in regards to sheidim, not ayin hara. Sheidim are creatures with feeling somewhat akin to humans. When one takes extreme caution to avoid them, that draws the attention of the sheidim to him. They are then ready to pounce the instant he lets his guard down.
Ayin Hara is a spiritual koach that has no feelings. Mahn d’kapid, kapdinan bahadei is only on sheidim, not ayin hara.