Metoro's suggestion to count was good advice. June 12-13 was when Sun rose at the White Spot (Al Hak'ah). Surely the venerated Bishop would know that, because it was 120 days before Spica (202.7) in October 10 (where Metoro earlier had said vero hia):

Heka rose with the Sun in June and counted from the beginning of side b this was 630 - 392 = 238 days later, but it seems more reasonable to count from November 11:

November 7	8	9	10 (314)
Cb1-21 (413)	Cb1-22	Cb1-23	Cb1-24
hoea	ko te rima	kua oo ki te vai	ma te ua

213	June 12	13 (164)	14
	Cb10-8	Cb10-9	Cb10-10 (632)
	kua pu	ka hahaú hia - ko te rima kua oho	ku hahaú - kua ka te ahi i ruga
216 = 8 * 27

June 15 (166)	16	106
Cb10-11 (633)	Cb10-12
e te hau e	ka oho te kihikihi o te henua
108 = 4 * 27

There is not enough room for another return of Spica beyond Cb10-8. And Cb10-10 is 632 - 392 = 240 days beyond the end of side a.

We should also notice that 236 (= 8 * 29½) days beyond the end of side a corresponds to Cb10-6, which is glyph number 2 * 314:

June 10 (161)		11
Cb10-6 (628)		Cb10-7
koia kua kake		ka moa ki raro

Thus there could be a double reason for contrasting the 'climber' (kua kake) - having reached his limit in June 10 - with the crouching down (ki raro) bird in June 11.

But only a few days later, in June 14 and 240 days from the end of side a, there was a fist raised high (i ruga).