It's like he slowed time and took 4 shots while It just auto skipped my turn for 4 turns in a row?

Thats how it started

2nd picture

My last moments

So what happened? This guy starts attacking me, I use the healing infusion and take 1 step forward and suddenly huge fps drop and game saved you're dead?
Sorry if I'm posting this in the wrong section and I should instead post it in the crying section