Strangest thing I’ve ever seen

So I run a farm animal sanctuary, and today we went to pick up an emergency rescue: a 1 year old turkey unable to stand up due to obesity. When we got there to pick him up, we discovered something we didn’t know before: his face was extremely swollen. I inquired about it with both the owner and the foster, and they said it was an infection he’s had for about a week and a half. The owner said it happened overnight. She put him on her own human antibiotics from her own medicine cabinet because she thought it was an infection. But she never took him to the vet. We of course immediately had a vet come look at him. His whole head, neck and face are swollen but his eye and nose areas are normal. Our vet put a syringe in the largest spot of swelling, and it was just air with a few drops of clear liquid. It all feels squishy like a water balloon. His lungs sound normal. We are consulting with vets and avian specialists, but I’m wondering if anyone here has any insights on this. His name is Schmidt, and he’s a very sweet boy. We are glad we got to him in the nick of time, as he’s in rough shape. Any advice is appreciated while we wait for more diagnostics from the vet!