Blood is like snakes, and oesophagae are not trachea.
1. When someone tells me how long a snake is, or when I estimate it, I divide by two and add one third of the remainder. Blood loss is tricky to tell on scene, especially if it is potentially mixed with saliva or other pulmonary secretions, or rainwater, sweat etc.
2. Never heard of or saw a tracheal varix, and a lung bleed in an apneic unconscious pt would not ordinarily be magically defying gravity and physics to be "shooting out". Eosophgeal varix: blood all over all the time, not just on shocks.
My vote is oropharyngeal bleeding due to primary and/or airway access trauma (it happens, relax) and/or buccal or lingual injury, mixed with saliva and secretions and expelled in a cough, maybe powered by thoracic muscle spasm secondary to defibrillation. It pooled, then was blown outwards.
Things get confusing sometimes, and even if someone sees it wrong, they need to stick by their observation ("I saw XYZ") but concede that it could have been due to something they don't know about (don't guess and claim at mechanisms you can't assess).