No, edix, Long_Cat will be able to come back on, since Foob, Water, and Lawrence all have admin powers and can unban him. Speaking of Herobrine, he went on my friend's friend only server and caused havoc by destroying the spawn and building these massive spikes of TNT. I had to ban him. And this sounds crazy, but Notch himself came on. My friends can prove it. We took snapshots of the whole thing. Herobrine just needs to know who is boss Foob. Do what I did: blast him with lightning, smitekicks (if you have that plugin) and fireballs. And not to mention Kitty Cannons.