This Is pretty common actually. It happens when the sword bearer has aggro before Crotas shield goes Down. Crota will attempt his insta smash from his knees but if you avoid it he will chase you. Right off the edge if he has to.
If you Live he'll just teleport to his next destination after the timer on his current spot is up
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Interesting. I was kinda hoping he would just stay down below, but i suppose its a good thing that the AI is built to adjust back to his original path.