What would you consider to be the climax of the book Freak the Mighty?

It is tempting to award the climax to the intense scene
when Killer Kane has gotten a hold of Max and held him tied up about to kill him only
for him to be saved by Kevin almost miraculously.

However,
I am more partial to say that the climax is actually when Max confessed or reveals
rather, that he witnessed the moment when his father strangled his mother to death. That
is a huge moment in the story that gives place to many other things to come to an end,
and because it is the biggest 'wow' factor moment in the story.