Metoro's readings are helpful in this instance, because at Eb4-2 he said vero:

Eb4-2 (in period 11) follows upon henua ora (period 10) and Eb5-10 (in period 19) follows upon the autumn equinox (17-18). (Metoro did not have the opportunity to read tablet G for Bishop Jaussen.)

Vero has three meanings: 1) a spear or dart, 2) to turn upside down, 3) name of a lunar month (the 10th on Marquesas, about April on Hawaii).

To turn upside down symbolizes death (... Ulu fell on his face and died ...). Spears lead by way of association to the obsidian spear heads (matá) on Easter Island, an instrument for killing in the tribal wars. The 10th month on Marquesas (veo) suggests that rongorongo writers may have used this glyph type to indicate the 'death' of a season.

In the 10th period of E the same story is told by henua ora - the sun canoe has been drawn up on the beach and does not move. It is still, i.e. 'dead'. There is no vero glyph in G here (midsummer), because only half of the 6-month long summer 'year' has passed. In the E calendar the 'years' are defined by the solstices in G by the equinoxes.

As to 'kua tu te Ao' at Eb5-10 we need not worry too much about that for the moment, but ao means, among other things, 'nightfall'. It is strange how 'fall' in nightfall (and in the season fall = autumn) is English picture language quite similar to that used in the expression: Ulu fell on his face - i.e. the 'black cloth' covered his head (as when a black cloth is put over a bird-cage to silence the bird).

The little moon sickle (like a reaping-hook) at the bottom of Eb5-10 indicates darkness - the time of the moon. Presumably the moon sickle has been added to intensify the idea of 'darkness'. Autumn equinox means not only the 'death' of sun's canoe but also that the dark season has arrived and moon now is fully in command.