I love solo player challenging quests but damn this one was hard... I mostly level-up thru warzones and I don't do any quests really except for the class-specific quests... When I got to this one I had just dinged 24 (marauder) and hadn't learned the new force ability yet (and had no stims). After failing twice, I did this: Went outside, summoned the healing-shooting companion, made him give me his 9sec HoT, popped the 50% dmg reduction + the cooldown clearer, went in with 2 HoTs & 50% dmg reduction with another 50% dmg reduction ready for the moment the old man stepped in. I killed the big guy, went out, waited 1-2min for the 50% to get back, used my companion's HoT again and went in and finished it.