A case for delay during free throw?

[Rick Durkee]

At a team camp tournament this weekend, when a player on the gold team was going to shoot two free throws, no gold players were on the lane for the first free throw. They congregated behind the free throw shooter at the top of the key. They were not the least bit disconcerting, and they did not appear to have any particular purpose. They only occasionally even spoke to each other. After the first free throw, two of the players took their places on the lane, sometimes touching hands with the shooter on the way past. The delay was brief, but it occurred on all two-shot fouls. It didn't particularly bother me or any of my partners, but is this something I should have put a stop to just on principle? Do I have any grounds to prevent their routine?