I saw the demo, if I'm not mistaken you are talking about the time when you got survivor (29:00 - 29:30), please add the time you report about next time.
I see that this isn't unstuck, it's just happened because there were a lot of zombies near you and so they made a lot of pressure on you, therefore, you got up with no intention. therefore this is completely not your fault. So the slaying wasn't right in this situation, however, I don't see that this should be punished, Shadows may have thought that you used unstuck while it's completely can't be in this situation since you were the only human, but ok it's just a fault from him so no need to punish.
What I can say that you just can forgive him for that since he was mistaken but it's not that huge mistake, and he can promise he won't do it again because it can never be that human unstuck while all zombies, and if he did so then this unstuck is legal since he was already stuck and can't move and therefore he must use unstuck (this stuck BUG is found in many maps where zombies using knife blink and stop the human from moving at all so the unstuck is legal and must be implemented).
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Carbon please look at my previous reply, it's completely legal, its server BUG not unstuck, so it's not bobi's fault and no one here is sin, even you thought it's unstuck (I just know this because it happened with me and saw it happening with many others), and I even can't call it BUG because it's a normal thing to let you up when you get all this pressure
.