This is a pretty powerful technique. So, since the order of techniques is set for this attack, I would have to first perform a fire technique of at least B-rank, then use chidori, and then use this technique to basically use chidori to control the lightning from the sky. Even though this technique uses natural energy, it uses up the most chakra amongst the canon lightning techniques. To defend against this technique would be very hard, because it is super fast and also highly strong. However, I can take notice of the atmosphere changing and ready a defense before hand. I can't just do it after seeing the user perform a fire attack though, because fire attacks can be performed all the time without using this afterwards. But if it's directed at the sky, then I could probably guess what's coming next.
Since it says this technique has an advantage if used with height, I would use it when I am in the air, for example on a summon, or if I am on an elemental technique like an earth pillar. I wouldn't use it in short range though because it can injure me, unless it means I can kill the enemy, which in that case a clone can do for me. To defend, I would use a full body shield, but not earth since it's weak, nor water as it would electrocute me. Wind would be the best, then fire and lightning. I could also use a wall made out of any element except earth, or I could attack it with an S-rank wind technique, so that it can defend as well as go on to attack the opponent.
Since it says this technique has an advantage if used with height, I would use it when I am in the air, for example on a summon, or if I am on an elemental technique like an earth pillar. I wouldn't use it in short range though because it can injure me, unless it means I can kill the enemy, which in that case a clone can do for me. To defend, I would use a full body shield, but not earth since it's weak, nor water as it would electrocute me. Wind would be the best, then fire and lightning. I could also use a wall made out of any element except earth, or I could attack it with an S-rank wind technique, so that it can defend as well as go on to attack the opponent.