First let's say I very much doubt there was an 'incident'. The 'worst flight ever' report is probably beer talking remembering fairly bad turbulence. As for an engine running down on taxi in, again unlikely. this would be a significant incident that the CAA would start investigating and the details would have been noted in peoples' memories. There just might be something that happened, but going by hearsay like this, if nothing untoward actually happened, you have besmirched the good name of a commercial business with what I think is unwarranted accusations. I would like to think they would now sue your pants off.