Yup, looks like sun damage.
One of my Trinidad Scorpions lost all but 2 leaves when I first put it out (no hardening off, I was impatient and inexperienced) and it came back fine. Definitely smaller than the others now though.
Well, at least the silver part looks like sun damage. Mine didn't turn brown at all, but maybe that's the mid-point between "fine" and "Sweet Jesus, why did you just fry the crap out of that poor baby plant, why, why, why?"