Hi devs,
I’m gonna try to be as clear as possible because I couldn’t hit the Nvidia Shadowplay record buttons.
This bug happened twice, on the same map and same round, Trainyard, just beside the final delivery container.
I forgot the server name but it was EU and my ping was around 30.
I was playing as Aura.
I switched to my health station, but without putting it down, in that case as you know, you can keep walking and the “circle of action” will follow you wherever you go. Ok. So here I am trying to put this health station behind the width of the container (nearest to defenders spawn) and a Stoker launches a molotov at me, I tried to escape with the health station in my hand and the flames of the molotov just got stuck to the “circle of my health station” all around me and was following me XD It didn’t stay on the ground where the molotov was thrown, and I lost no HP !!! I was just running around with the flames surrounding me. Twice 
After that I tried to walk myself with health station in hand into molotv fire but it removed health, not all though. Seems that bug happened only when molotov was thrown at me.
I shouldn’t tell you about this one and keep it secret to counter Stokers XD