With all six seats accommodating adults, some gear from each of them and enough gas to get somewhere, what would you bet that this Baron was over maximum allowable gross?
While illegal, this will actually work just fine in practice with most piston twins as long as both keep turning.
If one fails, there might then not be enough single engine performance to maintain level flight above VMCSE and the pilot's only option would be pull back the good engine and accept the forced landing.
This aircraft appears to have entered a spin when the pilot got slow enough to run out of control authority on one engine and twins aren't required to be recoverable from spins anyway, while all singles must have a published spin recovery technique.
The aircraft appears to have hit the ground at a high rate of vertical speed and low forward velocity.
The area looks as though there were good forced landing sites available had only the pilot accepted that this was inevitable.