I found some interesting info regarding the antlers.
If a bull moose is castrated, either by accidental or chemical means, he will quickly shed his current set of antlers and then immediately begin to grow a new set of misshapen and deformed antlers that he will wear the rest of his life without ever shedding again. The distinctive looking appendages (often referred to as "devil's antlers") are the source of several myths and legends among many groups of Inuit as well as several other tribes of indigenous peoples of North America.[27]
In extremely rare circumstances a cow moose may grow antlers. This is usually attributed to a hormone imbalance.[28]
So maybe he was wounded in the baggage earlier in his life?