Danzo could never have imagined that his summoning creature, the Baku, would be so utterly fragile, sent packing straight back to where it came from by a single punch from Naruto. In hindsight, Danzo's decision to summon the beast seemed remarkably foolish.
In truth, the Baku couldn't really be blamed for failing to withstand Naruto's punch. One had to remember that Naruto was currently operating in Kurama Mode, further augmented by Sage Mode. A conservative estimate was that a punch from Naruto powered by Kurama Mode could crack even a Complete Body Susanoo, let alone when Danzo's summoning beast, the Baku, was continuously using Wind Release to indiscriminately inhale everything in front of it, which only inadvertently increased the sheer might of Naruto's strike.
One could only say that the Baku had brought this upon itself to a certain extent.
Chapter 97