Question (spoiler alert)

Maybe I'm missing something obvious, but can anybody explain why Menahem is in Berlin (and why he just happens to be in the same restaurant as Eyal)? And just what's going on with Eyal and his career in the Mossad? He's obviously under a cloud, but why do they send him off to kill Himmelman, anyway? Is it because they suspect he is "burned out" and want to rehabilitate him by getting him back into killing? This doesn't really make sense to me, but if this isn't the explanation, then what is it? And Eyal seems to be under the impression that the Mossad is going to spirit the old Nazi off to Israel for an Eichmann-style trial, but this implies that he's totally in the dark about the operation, which would be, as they say, a hell of a way to run a secret service!