Boon preventing damage in next room and Zarokh the Temporal fight

Yesterday I went into the Zarokh the Temporal fight with the boon preventing damage and it worked for 90% of his kit, but whenever he used his lightning ability where he spins in a circle, the lightning would damage me. This didnt remove any honor from me, but it very nearly killed me by depleting my energy shield.

Not sure if this is intended mechanic or not, but figured id make a report.

You know what, I bet that is indeed what it was. Still don't know if that interaction is intended to work like that though.