I do wonder whether the crew was really unaware of the incident until hours later. The damage to the approach lights was significant – would no-one have noticed an unusual sound? Dare I wonder whether the crew might conceivably have said to each other, we seem to be in one piece, no indications, let's carry on and avoid the hassle of going back (and we didn't say that, so don't pull the CVR breaker)? No, no, of course not ...