Ah, so he swung very horizontally-diagonally... so he would basically apply all his strength in hitting the upper right arm, since as you rightly pointed out that would be between him and the yth's neck and be hit first, and due to the more vertical angle he would hit only that, but hit it a lot. If I understand this correctly he would actually end up cutting a long gash along its upper arm, almost all the way to the shoulder. That would damage that arm a lot more than I thought it would. I've made a quick edit to the post; is it better now?