Ah, I see. Well if you want a little more info to debug it, the boss would wait then dash at me and repeat and it seemed like I couldn't damage him. I thought the fight was still going.
Scaling the pillar itself was interesting, one of the more memorable moments. I think that after I got the power up, I was supposed to exit left? I ended up going right, putting me back in the "enclosed" area. So to get out I tried jumping through the small gaps.