The boss roared in pain and came after Gage. No matter what Gage did, this was going to hurt him.
His health took a heavy toll after he was attacked, but Gage was able to avoid getting crushed by that giant boss monster.
Both Olivier and Phoenix realized that Gage was not going to die even if he took the boss's attack head-on. So instead of focusing their attention on that boss monster, they decided to go after the priest instead.
After all, even if Gage survived on low HP, it would not matter if he could not heal himself, and without a priest, healing back would be impossible.
With the help of Olivier's buffs increasing his attack, Phoenix was easily able to dispose of the priest. Meanwhile, Gage engaged with the boss in hopes to crush it.
It all ended up in failure when the boss swung his club once more and dropped it down on Gage. The Warlord was not able to stay alive anymore.