Most likely it was a connection issue. I had it happen last night as well, strait to orbit I went! If you really want to see if they are cheating ECT, go to gaurdian.gg and drop their name in, look up their games and you will see in each game if someone leaves/kicked it will show up in a a catagory called deserters. But as others have said, just report ingame, let Bungie do their thing.