cmonurz Exactly, Dirk.
Feds' form has been getting better and better but in this instance he got it wrong. Narrow the angle and you leave Lukaku one option - and if the striker buries it in the far corner then fair enough, it's a quality finish. As it happened, Lukaku had two corners to aim at, and the near post was the easier finish.
He didn't have time to narrow the angle, Lukaku should have been no threat, but the second he cut inside because Mariappa let him, he shot and Feds was caught out by it. He guessed far post, shifted his weight, realised his mistake and couldn't get down in time to stop it.
I'm not saying he's faultless, he should still really have saved it. But the shot should never have been allowed to happen in the first place. You can't stand off a striker and make no effort to commit them away down the wing, it's just terrible defending.