yes, I believe you can also dire beast and kill command in def stance too, would like confirmation though.
You cannot use Kill Command in defensive as it is a player actioned ability - but yes you can leave your pet on Nazgrim - not sure about DB, but might be like AMoC - if you hit the button just before defensive, the damage it does isn't counted toward his rage stacks.
Leaving the pet on is better for SV than BM because in defensive you still have access to your primary attacks (for adds) and the Pet can have 100% up time on Nazgrim - where target plenty of target switching hurts BM due to pet travel time (blink strikes or sprint might be on CD when you switch) - but if you can stack the adds, pet cleave is still decent...
Awesome thanks - back to passive and KC macro for Nazgrim then
You actually don't "need" to macro KC target to Nazgrim, if your pet is on passive, kill command will always attack the pets current target (regardless of which enemy you have targeted)
The only caveat to this is that if you have no target, you cannot cast kill command despite the fact your pet has a target. In this case, without a kill command macro, you can still manually target Nazgrim and cast kill command.