I got an idea. Get Minechat, log into the server with Minechat and type /lobby. Then, once you're done, go on Minecraft, on the J&H server. Then, BAM. Your in the lobby again :D
Unfortunately, not everyone can get minechat. So... He can always connect to buildit.itsjerryandharry.com Then go to /lobby from there
He probably is, since if you look in his Item Hotbar, he has items enchanted, what isn't possible in the normal minecraft client. I'm not sure though if he got it from someone else. If you do use it TheAwesome, than try joining with the normal client.
Actually, it is possible to enchant those items. Only in creative, though. Just requires an anvil and some enchanted books.
Ooh, stupid me. Before I made that post I went fast to creative and tried to enchant a random item in a enchanting table. I forgot about the enchanted books stuff :L, my bad.
Well, I'm assuming someone gave you items with custom data made by a mod and apparently for some reason it causes you to die. Anyways, should be fixed
I see that you were holding enchanted nether warts? Those things were made by various VIPs, and go by many names, such as "The Best Thing Ever Hold It" and kill you if you hold them. This is because they have -9999999 zombie reinforcements, +99999999 attack damage, etc etc. I used to have 3 variations of the enchanted wart you were holding.:)