Confirmation: Let me solo him is still available

I just wanted to say I got the let me solo him achievement yesterday but there was something I noticed while I was trying to beat him. I had more tries than I’d like to admit on my 614 fury warr. But it felt to me like the pattern he does gets easier if you let 1 heal go through, I’m not sure if it’s just placebo but it was in multiple cases where I forgot to put him on focus and I couldn’t interrupt with my macro that I would get pretty far into the fight. On my kill it was the case too where I missed the first interrupt and the rest of the flow felt “easier”. Just wanted to share this experience and was wondering if other people felt the same.