Instantly died before Grig spawned, reason?

Wondering.

Did Grig on T4 like 100 times. I had about 1200 armor, 80% res all.
Never happend and I made another SB and stood in the lightning with way worse stats - nothing happend.

But my 12/12 upgraded on all items, BiS mythics died instantly lol.

It was just poof. The only positive thing is I can finally quit this season because I am not playing my Druid that can clear Pits 85 but nope and I am not making another Spiritborn just to one shot everything again and experience a one shot with no reason again.