Earlier today, I beat Shinryu for the first time.

The first three attempts, someone was spamming LB3 and then LB1 as soon as it was available and we would wipe at the end. MT tells people to chill out and stop spamming LBs.

Third attempt, we get Shinryu down to 20% and he blasts all the DPS dead, 1 healer dead, and I barely survive with a sliver left. I hear the "thruuum" of the LB just as I drop dead myself. 1 tank, 1 healer alive.

2 seconds later...

We're all up on our feet and we proceed to win the battle.

In fights where there's a lot of instant death (like Shinryu....), LB3 is better off in the Healers' hands than the DPS's.

Though if you're <5% then by all means... have a Melee pound the guy with it. You might just squeak a victory in.