Now you've got a bunch of people on an alien planet with potential alien lifeforms, bacteria, etc, and someone who claims to be a scientist thinks it's perfectly fine to take off his helmet simply because the atmosphere mixture is acceptable?
To be fair, American Indians didn't have interstellar starships, did they? If they have an automated medical bay which can perform Caesarean sections with fricken lasers they are probably equipped to handle alien microbes, viruses, and bacteria. I just don't think any of them were expecting to stumble into a cache of biological weapons.
Steam + PSN: PHJF