It's not a glitch. It's the games system putting crota back where he belongs. You escaped wrong so crota followed you then killed you. After 10 seconds crota will teleport back to his correct location. In this case the opposite side. The reason. This is in game is so if crota falls on bottom level he won't remain there whole game. That's all. Think about it as the vog shield. If thrown of map it teleported back to correct location. Now here's a tip. When done using sword run to ogre room then go invisible and go to wanted location. Less risky. 100% fail proof.