Zhou would laugh softly.  "What, can tell that I'm holding back?"  A shake of his head and he'd hold up his crackling blade.  "Lightning based zanpaktous are rare for a reason.  They're fast, powerful, and destructive as all hell.  I'd argue that it's on par with a fire.  However, I haven't yet unlocked bankai.  I'm limited by my current abilities.  Lets see if we can push each other to that next level."  With his reiatsu resonating with that of his blade, Zhou's lightning armor flickered around him, enough to stain the air with its anger.  He'd charge at her, not bothering with shunpo, merely moving forward with the blade held in both hands, moving quickly and with more strength behind the blade than ever before.  Should she try to block one of those strikes, she may end up thrown back more than a few dozen feet!