[@vancexentan] So it would appear that the draw of his power is concentration, like almost all magic, but Greg is not as proficient as he could be. The limit/extent of his power has to d with his grip on reality itself, and being able to concentrate on what it is he wants to change within the normal scope of reality. If someone like, say, Simon or Miss Martian were to begin playing mind games with him, blurring the lines between what is real and what is not, it would be significantly harder for him to use his powers.

Correct?