I was not on the plane so I don't know but if I was sitting on a plane and there was odd turbulence and then people at the window in front started exclaiming that the plane was on fire then I would be worried.

In addition disintegrating jet engines sometimes cause problems by shooting fragments of turbine into the body of the plane. There are very valid reasons to be worried even if you know you have one working engine.

You have contradicted yourself by saying, "someone with very little knowledge about planes (such as myself)" and also saying, "It's a failure that happens all the time." Knowing that the engine failures happen all the time is not something that someone with very little knowledge would know.

In short your comment was not well thought out.