might as well pluck all the dead leaves now, but yeah looks like the plant just starting consuming leaves which is does anyways at this point but that could of been caused by the missed watering and or lockout situation that can happen when things get too dry then with giving them a full dose on that next watering, i always found it safer just to give a lower concentration or straight water initially if things went too dry then come back the next day with full feed strength that way the plants are dying for water and not being selective in what they take up as they just want water.