Hitting the ground at 700ft/mt. is not a little boom. As long there is a flare let him manage the rest. I had a lower flare than most would do. With a low time pilot on three consecutive landings I flared and then let go and he was happy with the result. When I told him I am the one who is flaring he was surprised and said but there was no dual input warning. I told him that's right because there was only single input but that was mine. Then he confessed he has problem assessing the height.