This happened on Xbox. My gamertag is swordthief. This happened during the Inverted Spire strike when you are about to jump down to face the Modular Mind. If your fireteam jumps down but you stay up high, it starts a timer. Now, I don't know if this was a fluke, but the first time I ran Inverted Spire and it did this, my countdown timer was off. It was counting in the negatives. It said "Joining Allies: -1 -2 -3 -4 -5" which I thought was weird. It has only happened to me once but I figured I would still post it in case others have experienced the same thing. Sadly, I was not smart enough to take a game clip of what happened though.