I Feel very strongly I was right, give my you thoughts.

[Arachne]

I don't think you did anything wrong.

But even if you had... the way she reacted is completely unprofessional and rude. If you are there as a 3rd rider, she should be teaching and explaining, not yelling at you. I hesitate to judge without having been there, but it sounds like this medic has more problems than oxygen administration.

Pardon me if this has been mentioned already, but have you asked her to explain how high flow O2 is a problem for patients on blood-thinners? It would be interesting to see if she has an explanation and how plausible it seems.