TC,
Not only do twins have a HV curve, the chart is in the limitations section not the performance section like singles. Plus, since most long line operations are heavier than Cat A weights, about all the other engine will do is help cushion the landing. If it is still running. Since in most twins the engines sit side by side and feed off the same fuel tanks, if you have a fuel issue, you will most likely lose them both. And if one engine comes apart it WILL throw pieces into the other engine.