Possible grav lens arc below galaxy cluster. (Interaction trail)

http://legacysurvey.org/viewer?ra=174.5839&dec=-8.7632&zoom=15&layer=decals-dr5

I would guess it’s a tidal tail (there seems to be a faint ring all around the lower-right galaxy) vs lensing

Yes, it could be, but it looked as if it might have a blue tinge to me so I thought it might be worth a closer look.