Emet-Selch accompanies the group intending to be support, but he can step up to act as a frontline fighter if the need arises. Such as now, facing this creature: he raises his heavy greatsword just in time to block a flurry of strikes. The pale eye in its 'head' and its general build makes him think that it may be its greatest strength - and weakness.
It's a good thing then that he understands his own weaknesses.
Leave an opening for it to exploit and then go for the kill, is his thinking. But he won't be able to get close to it himself if he's the one drawing attention. This is not the sort of trick you can pull of again and again either. Not against a clever opponent.
"I need someone to attack while I occupy its attention!"
Emet-Selch | Final Fantasy XIV | open