LOOKS LIKE A PHOSPHORUS DEFICIENCY PISTILS BURNING UP. Do you have red veins? my only other guess would be that something pissed on it, or nutes got splashed on it... did it rest on the window at all? my windows get real hot and could burn a plant like that easy
its in front of a sliding door . im use bone meal already.. ive flushed it out for the last week..buds still growing nice..the top bud is the one fucked up.............