The linear structure reported by P. van Dokkum et al. has been proposed as either a massive stellar wake produced by a runaway supermassive black hole (SMBH) or a bulgeless edge-on galaxy. New JWST/NIRSpec IFU observations by P. van Dokkum et al. target the tip of the structure, where a SMBH would produce a bow shock, whereas a normal galaxy would host an H II region. Using standard Baldwin─Phillips─Terlevich diagrams ([O III]5007/Hβ versus [N II]6583/Hα and [O III]5007/Hβ versus [O II]6716,6731/Hα), we find that the line ratios at the tip fall on the locus of low-metallicity low-extinction H II regions. This region does not overlap with loci typical of shocks in merging galaxies. Thus, these results are consistent with the interpretation that the linear structure is a star-forming galaxy, with the bright knot representing one of its H II regions.