The first failure I had the shrapnel was contained, in the second a lot of shrapnel exited tangentially, which could have had implications for the tail rotor drive as the shaft ran between the two engines.
One S-76 with Allison engines had a engine failure that severed the tail rotor drive shaft, severed the battery connection, and as result of the other engine being taken out as well, total electrical failure. We flew with a mod we called the BBQ plates, weighed some hundreds of pounds to contain the shrapnel until the engines could be modded.