died in a strange way, what you think?

[Diogene]

So I was reverse charming Xalgoz, until he kills every fucking thing and and still sit at 60% HP. I decide to camp and come back later with another strat, but charm breaks, so he jumps on me and quickly gets me down to 20% HP, until I stun him with color slant and spam gate. Successful gate (reading the log), but in fact I died. is that a bug? What should I do?