What happen?

Is this your Critical Kush? First of all, from the photos you given here, this plant is in desperate need of some extra phosphorus - and while you're at it, some potassium as well would not go amiss.... And you may not think this is a lockout but the words you've used in your comment below might suggest otherwise - if you are only giving them clear water "sometimes," it is most likely the nutrients and the salts have built up to a point where they have created a lockout. You need to practice the routine of water/feed/water/feed - and when you give clear, pH'd water, you need to give it enough so that there is a good runoff... this helps to clear the build up of nutes and salts... I also believe you need to flush your plant - 3x the pot volume of clear, pH'd water in one sitting - but in the last water you give her, add 1/2 strength nutes to which you also add 1/2 strength PK booster. When she's dried out, you can water again and when she's dried out from that, you can give her your regular dose of nutrients but definitely add the PK booster to any feeding you give her. The damaged leaves will not repair themselves so don't expect that - they may get a little greener but the marks on them will not go away. If you have solved the problem, you shouldn't see further damage being done after a couple of days. Good luck....