Actually I have to interject. On the cosmic, and even local scale, sound is almost insipidly slow. Plasma is electrical in nature, and while denser, still travels far, far faster than sound. Lightning is a form of plasma and moves at lightspeed. Video game logic is not an ideal system to use for combat RP. Especially in the tier you're in. 

Here is further proof of my claims:http://www.redorbit.com/news/space/1112660343/plasma-waves-move-faster-than-shockwaves/