It's alright. In order to farm the restorative mind, you need to die- and basically get a postmortem on the boss just as the timer on the wipe screen hits 1 second as it restarts the fight- but the loot the boss drops is still there for you to pick up. You can do it repeatedly, however players did that with Omnigul and Bungie patched it so you can't farm her anymore as she will only drop loot once perk strike even if you wipe to try and farm her. So if you have the method and timing right... you can forever farm almost any strike boss.