Now that I know that not knowing what is happening at the nest site is worse than knowing, I went down there last night. The male raven had just finished escorting the female back to the nestbox when both falcons swooped down and attacked him, dive-bombing him on top of the building where he had taken refuge; if he had panicked, they would have got him. I think he had flattened himself down pretty well, and he stuck like glue to the top of the building. After numerous fly-overs and dives to get at him, the falcons took off, then he stuck his head up and started cawing at them, and they came back and gave it another go. After that, he must have figured it was better to keep his opinions to himself, and he laid low. After a few minutes, he popped up and checked out where the falcons were, saw that the coast was clear, and flew over to a crevice close to his lady-love, and that was the last I saw of him. The falcons, meanwhile, positioned themselves on the top of near-by buildings where they could keep an eye on things, but by then it was getting dark, so I do not expect that they attacked again.