I guess since TTG confirmed that Larry was alive (I didn't see the confirmation, but I guess others did) he wasn't quite dead yet. Kenny jumped the gun, it would've been the right call if you knew you couldn't revive him, but even if you have a heart attack you don't just die. If that were the case, no one would ever need to get the paddles because you just declare him dead on the spot.
I don't think I'm going hold it over Kenny, but he does need to relax. The tension he is causing is bad for the group.