While doing Crota on hard last night, during the second attack using the first sword, Crota stopped taking damage and regained full health. I was firing 2 Ghorn rockets (lvl 33 titan with 365 Ghorn) which took down Crota on the first sword - my mate got 3 solid hits before Crota stood up (which seemed quicker than normal) Then 2 more rockets once he stopped glowing - the first one took half his shield but the second one had no effect and he actually recovered full shield while the wolfpack rounds were still hitting him. I fired a 3rd rocket which just dissapeared and made no explosion?! We tried 3 more times and exactly the same thing happened at the same point each time. I captured some video of 3 attempts if anyone's interested (only 1 minute long) https://youtu.be/492v9xRowGE Never seen this bug before - hope it isn't a perminant feeature now!