I’m probably not the first person to realize this, but I think it’s important that I put this out there. 

The brain operates by sending electrical impulses to its different parts. Fire benders are able to bend lightning (a form of electricity). If a firebender utilizes his/her ability to bend electricity, he/she could control one’s thoughts/mental processes. Mindbending. Mind blown. 

However, it does not stop there. Electrical impulses are sent all over the body via the nervous system. If a firebender inhibits these electrical impulses from travelling to where they are needed, he/she could paralyze his/her enemy. 

Now, what I would like to see is a bloodbender go against an electricitybender, because that would be epic.