It feels a little unfair with the teleportation and wildly swinging the camera around. On the bright side, it's another opportunity to try out new ideas. I didn't use a shield for blocking (just parrying) the whole game so far, but I tried using magic shield here. It's effective but for me having a shield up ruins my dodging reflexes, so it isn't worth it. Bastard sword doesn't seem fast enough and even the uppercut was somehow failing to do damage to Lothric. Thrall axe short range is bothering me. Morningstar trading doesn't work. I'll try upgrading a straight sword, which I've heard might be the strongest weapon type in the game.
Edit: beat them on the 2nd try this time (using dragonslayer axe 2-handed). Now that I wasn't frustrated, I calmly glanced around the room to dodge the teleport beam. I was still really bad at hitting Lothric, but that just made the fight take a long time, since I could dodge everything.