Almost all of these happens to my group when doing HM Crota. We all get excited when we're about to kill him but it all goes downhill when we wait too long on ogres to spawn. Best one yet was when the sword disappeared and we had to wait for next sword bearer. Somehow we managed to beat Crota on that run and buddy got Crux. Pretty easy raid without the glitches but I guess the glitches do make it hard.