Ah, yes. I suspect that was what I was thinking of, and conflated the two. Regardless, Eldritch Knights get to teleport out of Force Cages, up to unreachable ledges, etc., and that's definitely a trick in their favor, in comparison to other fighter archetypes. Can you tell it has been a while since I played an EK?
Sure. I'd also consider Thunderwave (added bonus of potentially pushing away anyone left alive).BTW, I wouldn't Shatter those kobolds but I would willingly Thunderclap or Sword Burst the biggest concentration of them, and then War Magic one of the survivors. Cantrip AoEs are cheap and reasonably effective.
(The bigger problem is what to do if the kobolds are dispersed and using their slings instead of meleeing in Fireball Formation.)