Devil boss battle glitch?

gistfile1.txt

When fighting the devil and he does the move where he stretches his
neck up and then comes slithering in from the side like a snake, he
seems to be able to hit you while he's retracting back. But only when
he comes in from the right.

This is me doing what I think is the correct thing to avoid his attack
when he comes in from the left:
https://gfycat.com/closedlateamazondolphin

This is me doing the same thing when he comes in from the right:
https://gfycat.com/klutzyyoungalligatorgar

I repeated this many times and in the gifs above I took extra care to
check that none of the minion devils were coming in (I originally
thought I was just getting hit by them).

Am I missing something about how this attack is supposed to work or is
this a glitch? I'm playing on XBoxOne if that makes a difference.