I experienced a situation yesterday on two occasions whereby I was dropped into a weekly heroic where two guys had already got to omnigul before I joined. Once I was dropped in they just retreated to outside and went afk. The first time I didn't realise what was happening- but I suspected they weren't happy that I joined, so I went to orbit. Tried to do the heroic again and once again got paired up with a group that had reached omnigul. Same thing happened. Luckily third time I joined a group which had both been taken down as I joined so I revived them and we went on to finish her off. My issue and frustration is this: it wasn't my fault I got paired with the guys before, the servers put me there. So to go afk because of it doesn't make sense.I didn't choose or ask for it. I have had it before where guys have joined me after solo'ing it at the end. I didn't stop. I completed it and we both got the spoils.Perhaps Bungie needs to put in a marker point where once the team passes point A then nobody can drop into the group. Maybe halfway or locked door points. All I know is yesterday was really frustrating