Okay, both of your moves have problems >_>
First, stop saying in an "instant" this word is purely cosmetic, nothing is instant other than a few techniques like Space-Time ninjutsu, and some doujutsu, so basically you both messed up the timeframe a bit trying to bend it in your favor.
Let's review the timeframe, Genjutsu, Lightning spears, fireballs, so given the genjutsu was formed then followed with the fire, there's a small "interval" of time when the opponent notices the genjutsu to when he counters it, although it's a small amount of time, it allows them to counter the genjutsu and get ready to counter the next attack, but in this case i'd say both lightning and fire techniques happen at the same time, the "activation" that is, both are pretty fast techniques, so Perception, since you didn't defend against the fire, you have to defend against it in your next move, i won't say you are hit by it, as you have an equal amount of time to counter it just like the amount of time Shadou had to counter the lightning, but the lightning won't be fast enough to stop the creation of the fire technique, nor would the fire be fast enough to stop the lightning, although if this was an official tournament, i'd give the win to Shadou, since you didn't defend against the fire and simply approached him to slash him. Unofficial battles are just for fun