It's a good idea to kill medic first, as the name suggests, will heal the other mercs. Another good idea is to stand on top of them (still on the lighthouse ledge) so you don't miss too many shots. It's very painful seeing you miss this many shots lol. With elites it's basically the same, just harder and you have to stay on the other side of the glass than demolitionist. (It's a good idea to get a suppresed rifle for demo) Anyways, good video!