PT2 bellows in the Fuel Control Unit fractured, I believe, causing effectively an engine run-down. One engine on the failure side had been T handled, feathering the prop.
Second failure occurred before the aircraft reached VMCA2. After this crash, the perceived wisdom was to throttle back the powered wing's outboard engine and full power on the inboard and look for somewhere to put it down.
On the Herc OCU we used to demonstrate a 'single engined' circuit with 3 engines at flight idle and power at 18,000"/lb max on an inboard.
I only used to do this with one particular QFI, but Uncle John S. put many new pilots' minds at rest by showing them this.
We were of course empty down the back and at training weights.