Notice that it is spelled with waw after heth. This is a good example of waw standing for any vowel sound. See further discussion of waw as semi vowel insertions by Q scribes in the introductory page. There are similar additions to 2m and 2f suffixes. See also comments in the commentary on this word.
Q adds prep.
Perhaps the first word in Q does not follow the context of the last line. But this word in question falls before the gap and belongs in the Q scribe's allocation to the end of vs 15 not the beginning of vs 16. There is no room on the margin for the supposed yod that does not appear. Compare the daleth in this word with the daleth two words back where the scribe doubly inked over the daleth so it would not look like a resh. It is without doubt not a kaph.