⇢ ★ ★ Just r4 bandy as much as you can while tanking the room. r4 bandy when toggling while crew is attacking NF. Usually around 10-12 r4 bandies is enough to hold him, but the more the better.
Don't leave any monsters while crew is attacking NF. A lot of tanks make that mistake.
If you feel like you didn't get enough aggro, before the crew attacks or while they're attacking, have them toggle and rage wish on them.
If you lose aggro, just wish and diag the crew till they kill him off.
If it's early, you might want to try to get aggro back by continuing to toggle and bandy yourself while healing the crew, and once you get it back have them stop attacking so you can heal yourself more to build aggro again.