only if you have the aura up thats one of the disadvantages of having it mixed in the aura like that I actualy should apologize I should have looked closer at that part and seen If I could have found a way to split the difference for you.
As it stands though you had to change the aura out for the lightning bolt to use it.
in fact thats why he got so lucky with that save, he didnt have his own Force Field up at the time or it would have shocked you and protected him better.
a current alternative would be to spend a hero point to snap your own electrical aura in place as a counter. that would seem appropriate for a HP useage.
dont forget you didnt have to spend the hero point from the investigation roll.
id say spend the HP and make a reflex save that will cover you nicely.
Dr. Silverback has wryly observed that this is like trying to teach lolcats about Shakespeare