This has been mentioned before but seriously, what is it with boys trying to Copernicus you over a good night kiss? It just leads to laughter and there's no way to explain it. "Well, you see, it's like a hug (or kiss) but almost a strangle. And there's a monkey that may kill you in your sleep."
I learned in Drill Team years ago that when you're in a kickline, you keep your thumb in, next to your fingers, otherwise you hit a pressure point on the girl next to you and they drop. That could easily happen when you're Coperni-kissing. There shouldn't be a thumb on your collarbone and a hand around your neck. Keep those thumbs in guys, it doesn't give us confidence in the rest of your abilities.