I failed Trails of Skehemas while having full hp

https://cdn.discordapp.com/attachments/293975363942612994/1368461295900430367/image.png?ex=68184e65&is=6816fce5&hm=0f4d425c654a9af6710c6c528df741b0f97c92af37837518573593b5a0f1fa04&


I got hit once from the boss and failed the trail. I have like 75% honor res and I had over capped hp. Just don't know what happened