>>I’m guessing an engine out. If it had been something bad. . .<<
Well. . .I’d say anytime you lose an engine it is bad.
Anytime you lose an engine and all you have left is one engine, you have a major bad problem.
Lost an engine once myself, I was flying an A-10 when the number two engine decided to $hit itself. Flying on one engine was no problem, but nonetheless I elected to land at an RAF base. . . just to be safe. Home was about 15nm further, mere minutes, but how do you explain to the mishap board that you overflew a good runway when you already lost one engine (for an undetermined reason), and lose the other engine for the same (undetermined reason). I’m not much of a gambler when all you can win is a few extra minutes of flight time, and what you can lose is, at best, the jet, and at worse, your life.
Given the unknown nature of the incident, I’d be more inclined to think it was a problem of a less serious nature. Of course, with British Airways electing to fly a 747 from LAX to LHR a year or so ago, after the jet lost an engine on takeoff, one never knows about the judgment these days.
In BA’s defense, they still had a couple of spare engines.