If someone cut in front of you on line, or you thought they did, would you say something to them?

I was on the return lined in Costco yesterday. The line was out the door and I got behind someone, and not long after, someone else got behind me. As we went through the door, toward the return counter, a couple appeared and said to the man in front of me that they were “behind him” because they were waiting elsewhere. I put on an unfriendly face, and stared straight ahead, and then the man (of the couple) said to the person in front of me that they would be behind me.

I was just thinking “All I know is that they’re not in front of me.” I figured whatever they did behind me was between them and the person behind me.

The person behind me didn’t say anything to them.

If someone cut in front of you on line, or you thought they cut, would you let them or would you say something?