only if your group is completely retarded and doesn't move out of the red circles
No, that's not a trial, that's a guaranteed wipe.
What makes it a trial is that the boss will ignore agro to throw grenades that deal a pretty savage amount of damage at people who aren't the tank, while savagely beating down on the tank. I don't know how well scoundrels or sages work in this fight, but it was brutal for my mercenary to get no chance to let her heat die down. I had to just keep switching back and forth, throwing down chain heals and dancing around in max heat regen levels.
It's almost a relief when he starts spamming missiles, because the missiles delay his grenades.