Here’s how it works: Wait until the group ahead of you is within striking distance of your tee shots. Ideally, this would be a time when they are waiting on the group ahead of them so they are stuck in the danger zone for a good while. Hit your tee shots as if they are not there. You obviously hope you don’t hit any of them and cause serious injury, but what are the chances of that happening? Not enough to worry about–that’s how low. The group you’re hitting into will be totally befuddled as to why all four of you hit into them when they were clearly in harm’s way. Ignore them. Drive up to your balls casually, discuss your shot with your group, line up your shots one-by-one, and hit away. Meanwhile, the group will be angrily approaching yours and discussing your complete lack of acknowledgement of them. They’re invisible, so don’t look at them or respond to them. Nonchalantly drive away after your group has all completed your approach shots.