This is 100% reapeatable. Diring the initial confrontation in the Ritual, once Savathun leaves the arena, you can NOT complete the first part of the mission if ANY of the LightBearers kill THEMSELVES!!! This has happened to me three times now! My gameplay leaves me running around on the left side of the arena using the "wet area" for cover as well as the ledges around the little building surrounded by water by two sides. Once the Lightbearers spawn in, I typically use my Super/Grenade to kill ONE. After I crush their Ghost, I dodge for invisibility (Hunter) to escape and head back down to the wet area for cover. Typically this attracts a lot of attention (the other two lightbearers). On several occasions now, they have BOTH followed me down into the wet area, and as I run out around the ledge on the building (surrounded on two sides by water), one or both of them go a little too far in trying to follow me and KILL THEMSELVES! I then proceed to finish the arena (and the remaining lightbearer if he has not self destructed), and can go no further. I have hunted all over the arena and nothing is left alive but still the game willnot progress. I never see the bridge. So, apparently, the game is counting my LightBearer kills, and will not progress if they are so "stupid" as to kill themselves. After having found with this solo on legendary mode (as a Hunter no less), this is quite frustrating! I've not seen this mentioned anywhere else but it has happened to me on multiple occasions now. I really don't think I should have to alter my play style (using the ledges around the "wet" buildings) and expose myself any further than necessary to accommodate this bug. The ledges are legit and obviously intended for this purpose but if you fall off into the water you die (as do the LightBearers). If anyone else knows about this, please help me make Bungie aware of this!!! I am so frustrated at this point...