see this is going to take work i have provided a video to explain. the spike occurs where the whirls on his arms are taking place. But dont get happy yet. To get the front one to hit where the whirl is you have to aim with the tip of his hat in the front. if you just aim for the front whirl, it will miss and go to low to his legs. with the back. just aim for the whirl. so basically the easiest is when the tip of luigis hat in the front (the tip being the top part of the hat over the L for luigi). the video will be up shortly as im just uploading now. in the video i miss 2 and dont get the spike on the third lol. I had to rush before the battery ran out.