I take it that we still don't know for sure what happened to either the engine nor the aircraft from the standpoint of mechanical damage.
I assume the pilots just followed their standard procedures for a report of smoke in the cabin along with abnormal engine symptoms.
Understandable that the SLF in the back seeing the flash of flame out an engine along with the bang and then smoke in the cabin are going to be scared. I'm not sure that any experts have confirmed the degree of uncontained whether it be through the side of the engine or chewed up bits out the front or back airstream of the engine.