This glyph, I believe, represents rangi in some meaning. It is open at the bottom, which perhaps is a sign of openness. To be sure that this really is a sign, and not just part of the Keiti way of writing an unmarked rangi-glyph, we compare:

Ea5-5 Ea9-21 Eb1:38 Eb3-11 Eb7-17 Eb7-21

Probably Ea9-21 and Eb3-11 represent examples of the unmarked rangi-glyph and probably there are two signs in Eb1:38:

- open at the bottom

- straight vertical lines in the 'shaft'.

At this stage of the investigation, when we have secured at least a few footholds, it is better to hazard guesses than to remain silent. Guesses can be checked, silence not. Straight vertical lines could imply the real sky instead of the earthly endeavours to copy the sky (e.g. by princes in palaces).

And to be open at the bottom then could imply that the sky is possible to reach from the earth, a condition which - I believe - only is present when the period is ending and a new one is just to begin. If the period in question is a year, a half-year, or whether we should think in terms of the day is not clear as yet.

But this part of Keiti has 24 periods and that might point towards the day. If so, then we perhaps are at the time of midnight. The spirits are near.

The word koa / koakoa is presumably closely related to the 2nd night of the Moon, Hoaka (Clear) on Hawaii.