His body had also changed quite drastically - he had gained a few inches, and his muscles, bones, and organs had become denser. His centre of gravity had been shifted, and he would probably have to retrain his fighting style. Over his long life, Harry had actively used the sword of Gryffindor as a weapon, especially against certain highly magically resistant demons or magical beasts. Jon Snow was also a skilled and gifted fighter who had been trained to wield arms from the tender age of 7. The problem was that now his body was completely different, and Longclaw felt far too light in his arm.