I think people give too much credit to the % based mitigation and not enough to TBN simply because it pops and is gone but they can still see the others. The thing is that just because it popped and is gone, doesn't mean that it didn't mitigate as much as the other CDs. I've had several threads where I've talked about the math behind TBN (which I won't put again unless asked), and even though you aren't taking other hits raw, you are still equating to the damage completely mitigated by TBN. Additionally, while it is true that when you are pulling wall to wall that you will hit the amount of damage needed to exceed what TBN will mitigate in a single cast, you should also consider that you will get 2 TBN casts for every 1 RI/HoS/Sheltron. BTW, yes I know that you can cast Sheltron in rapid succession but it is my understanding that it takes about 30 seconds of auto attacks to generate the gauge.