Why at 1st fight vs metal monsters, the game says that Volnir is dead, despite I had no death, he survived the battle.

It's BS1, I had already replayed the battle, as I had not hit Tab to see the Force left and was surprised by his death 1st time (very newb at this game). But 2nd time didn't count...
However, I uninstalled all 3. I think even without this it is not my kind of games (and was bored by all these loadings). No bad feelings, let you keep the money to make better games, or which fit me better.

Hello have a look at this thread according to this he always dies regardless of what happens in battle.
https://steamcommunity.com/app/237990/discussions/0/558746089360343486/

Also according to other people the only way for people to die is either from story choices or starvation.