I would like to share this video with you. It may help you with killing Crota with 2 swords only without using a titan bubble.
https://www.youtube.com/watch?v=EuW8emTu1no
English
#Destiny
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I run crota hard the other day and our swordbearer had crota enraged with the first sword so we tried to take him down but the sword disappeared before we could. One and a half swords now on hard mode is all it takes