The boss fight/encounter is so poorly thought out. Only 2 opportunities to damageand then you don't even have enough time to call the chopper. I have the level 2 chopper body and even then I had to call it before I damaged him to be able to extract in time.Volgin
The more I play of this the more I think the moment to moment sneaking gameplay is the only thing that saves this from being complete trash. Which is a shame because that part is so fun.
Blame yourself. There are at least 4 different ways to beat the man on fire.