Maybe Conjura played a trick on him.
That’s the only explanation for this:
Lemme get this straight.
Ray Palmer, the Atom, the man who can make himself tiny on a sub-atomic level, thought that he actually disappeared once?
I can understand if someone else was scared and thought Atom disappeared. That would make sense. A bystander could see Atom turn super tiny super fast and think that he had actually disappeared.
But Atom actually thought. That he disappeared.
Sorry Super Dictionary, but even if this is the result of Atom’s head injury, I just can’t buy it.