User blog comment:Xilinoc/Ch. 550 - Blazing Bullets/@comment-1351982-20130925155535/@comment-11051098-20130925222143

Well, Zanka no Tachi literally dried the entire Seireitei more and more the longer it was activated, and could even destroy it in the long run. Everyone were affected by it, even a lieutenant who's skin dried. So I think it's unlikely that even Yamamoto was completely unaffected by the intense heat.