Un-contained exit of engine parts would/will go straight through most firewalls. On the PWC 200 it would possibly take most of the fuel manifold with it as well.
I have seen an RR250 eject #1 turbine wheel blades on a Bell 206. Through the engine pan - through the boot and onto the ground. Luckily it happened on the ground.
If the bits got to the remaining engine and caused a FIRE with that one you would have an interesting scenario. LAND IMMEDIATELY but do you press the FIRE button? Not if it is still running.
Had the same scenario recently in simulator - ENG FAIL just after TDP - remaining engine FIRE - LAND IMMEDIATELY - Do NOT press FIRE as it will shut down remaining engine.
If you do it is AUTOROTATION time DUAL ENG FAIL - night time it would help to restore the SHED BUS to get your RAD ALT back. You will be busy and it will certainly get your attention.