[Paddlewise] CB and CG in beam waves

Have a question about CG (center of gravity) and CB (center of buoyancy). 
I've been reading BCU's new (2002) edition of "Canoe and Kayak Handbook," 
and I refer you to an illustration on page 25. Here we see three paddlers 
in various situations: A) paddler has CG over his CB; he is sitting upright 
in a flat boat (no waves). B.) Paddler is leaning boat to left, body titled 
(to the right) over his boat so his CG is again over his CB; his paddle and 
right arm is extended over the right side of his boat. Both A and B are 
termed "stable situations."

In situation C the paddler is leaning into a large wave (well over his 
head). His paddle is extended into the wave (to his left again), but his 
boat is not leaned. His CB is way to the left side of his boat, but his CG 
is still centered over the CB; his head is over the gunwale, his body 
leaned just enough to get CG over CB. The text on the page 25 and the next 
page reads, "If the CG's vertical alignment falls far enough outside the CB 
you will capsize unless you support (provide additional support upwards) on 
a paddle stroke." And further on, "If you look at Fig. 2.6c you will see a 
paddler about to capsize."

I am not sure I understand this. The paddler in Fig. 2.6c still has his CG 
over his CB, thus (possibly) contradicting the text.

I now speak from personal experience. This winter (in rather chilly 35 
degree ocean paddling) I leaned into a breaking wave near an offshore reef. 
I tried keeping my CG over the leaning side and my CB, extended my paddle, 
and the wave broke on me, apparently catching my boat's edge. I went over. 
Fortunately I was able to roll up, took a breath and another wave caught me 
off guard. I flipped again, rolled up and got the devil away from the reef.

Will you offer me your insights? I am not sure what I may have done (and I 
don't expect perfect clairvoyance from anybody, since this is not on film 
;) I would like to mirror Wayne Horodowicz's techniques for broaching wave 
action, but I'm still a learner of the surf stuff. I am a fairly good 
paddler and can handle reasonably energetic seas, but in the breaking stuff 
I frankly suck.

Thanks for your instruction and thoughts!

Tom
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