Does the pattern go back to doing garter stitch at this point? If so maybe you could do the decrease row in garter stitch, since that is the simpler stitch, but since the seed stitch is the last given that is probably how it is written. You would keep doing seed stitch until it told you otherwise.
Unfortunately, I think it should be seed stitch also since there is not another stitch mentioned on this piece. It is the left front piece of a long jacket. Thanks again. I will be… :knitting:
Kat