I've recently known that Crota's End last battle has some issues. I've found that at the start, it's possible to avoid the "Presence of Crota" with a Sunsinger bug, but first of all, I've known that if the fireteam leader quits and close the application, Crota will stay on the knees until the end, vulnerable to the sword slashes from the other five players (and the fireteam can obviously re-join the fireteam battling Crota), making Crota easy as shit. IMHO, that's a huge shame against all the fair players who fight Crota honestly, like me. Bungie, fix this shit ASAP.