So if I got attacked by fire again and again?
You have to dodge those, I got hit a few times but It didn't prevent me from beating him, maybe made needing to aoe him more, but without any feedback I have no clue. Just know I him him so many times before he finally just stopped and fell over.
The way i avoided getting hit was understanding he can only hit you in 1 of 4 ways and you only need 2 methods to avoid them all. So if he is above you or below you you should move left or right of him as soon as he spawns in, and if he spawn to your left or right move up or down.
The problem is he is really fast, that's why I said in an earlier post that I would run a zigzag pattern to avoid him easier over longer distances.
For example, if I was in the top left corner and I needed to get to the bottom right I wouldn't go down then over like a big 'L' I would move in the shape of a big set of stairs, down for a few seconds over a few seconds, down and over again then probably up for a second because I went to far down the over some more till I made it.
If I was close I would just go directly there and dodge dad as soon as I saw him.
Not saying you should do this, just saying that was what worked for me.