I dont think so, it was a bug if berengar lived.I'd like to see Berengar again if you managed to keep him alive.
It took 6 tries to keep him alive during that fight in the first witcher! But I did it and I know others did too so it would be nice if it were possible for them to show Berengar in a way that makes sense.
he is supposed to die in that fight and it´s canon that he does