[Authoritative Server] Changing Health

Hello everyone! I am currently trying to make an authoritative server, and currently my brain is going crazy! 0.0 I'm trying to have my raycast's hit change that players health by X.

So currently I have it create a ray and send it forward and checking if it hit anything: http://pastebin.com/GVrwssRu Now >HERE< is where my brain is confuse a little. Do I want to send the dealDamage RPC to the server only and have the server change that peron's health and then send every person that person's new health? Or is there a better way of doing it? http://pastebin.com/CAKaSg3g

I am just currently a little confused right now... Maybe it's just a temp brain block lmfao :P