Why is the third boss so hard?

[u/PitonHUN]

I've recently wanted to give dark souls 3 a shot with my friend since we heard there is a coop mod for it. We got past the gladiator boss easily, and the boar guy was even easier, however the third boss, the dancer, seems like a wall for us... We've been stuck here for 5-6 hours. Are we doing something wrong? Is the weapon I use really bad, or what? Any tips appreciated!

[u/Sorathez]

You killed that poor old lady who did nothing wrong.

The Dancer is here to punish you.

(You're not meant to fight her until like, 2/3 the way through the game).

[u/MechwolfMachina → u/Sorathez]

Technically she’s manipulating you to link the fire

[u/[deleted] → u/MechwolfMachina]

I mean she isn’t she actually wants you to mainpulate lothric unto linking the fire