it sort of depends on how you want to look at it, guys. the 'flame' (and i assume by that you mean the light surrounding the lightning?) may be just that - light given off by the lightning. if so, you can see where he is evading the actual lightning bolts themselves. if they came at him at different times, what is shown is completely possible. he's still fast as all hell, but not intangible. as i said earlier - why'd he have to leap out of the path of the strike in panel 3 if he was intangible in all the other panels? aside from being out of character for post-c supes, it also just plain makes no sense in the comic itself.
but, as i said, that's just my opinion.
ps-do you know how silly i feel trying to LOGICALLY explain an image that was basically drawn because some artist thought it 'looked cool'?! man, i gotta take a break from this forum . . . .