I'd like to tip my hat to this week's fortnightly challenge with this question by revisiting an old one.

I asked a question about the Science behind a naturally invisible creature a while ago. At the time, I was handwaving the evolutionary concerns of my Sneaky Devils and looking only at the end result. From the answer to that question, I reengineered my Sneaky Devils so they constantly emitted a magnetic field specifically designed to interfere/disrupt the visual processing of nearby creatures (induced hemianopsia), but which has no effect on similarly developed creatures (they can't force each other to ignore the other).

Suppose that a predatory creature developed in this fashion. What would be the evolutionary concerns guiding its development?

I'd like to tip my hat to this week's fortnightly challenge with this question by revisiting an old one.

I asked a question about the Science behind a naturally invisible creature a while ago. At the time, I was handwaving the evolutionary concerns of my Sneaky Devils and looking only at the end result. From the answer to that question, I reengineered my Sneaky Devils so they constantly emitted a magnetic field specifically designed to interfere/disrupt the visual processing of nearby creatures (induced hemianopsia), but which has no effect on similarly developed creatures (they can't force each other to ignore the other).

Suppose that a predatory creature developed in this fashion. What would be the evolutionary concerns guiding its development?