Why did he even approach the enclosed brick vestibule? has been something I have mulled over.
There was no sign of forced entry including a welded steel security door and the side glass windows were intact (a common point to breach to reach in and flip open the deadbolt).
The vestibule was dark and provided cover, but he seemed surprised by the doorbell camera. It was however tucked away and the scope of the camera was narrowed by the structure of the brick vestibule and far enough from the side yard approach that it didn't even need to be disabled as a general casing of the home. It was a hard point with a steel security door and multiple locksets and a deadbolt.
A couple possibilities remain as to why he approached there.
1. He used the front door as a ruse to get NG to the door and then intimidated and coerced her into opening the door as he was clearly displaying what looked to be a firearm. If he had some info on her or her family he could have yelled a ruse convincing enough to get a startled elderly woman to come to the door then say he'll shoot her through the door/window and she panicked and let him in. Stranger things have happened.
2. Another possibility is he had an accomplice already on the inside and they removed NG through the front door into the driveway (trail of blood right at door swing clearance) to a waiting vehicle (which would be obscured from the street - see pics related. Police truck at walkway is obscured from street view in daylight). In that case, however, I would expect his approach to be more purpose-driven, quick and non-hesitant. The way he went about it doesn't translate into that scenario but maybe he's just weird like that. That would indicate a different primary point of entry and I am curious to see what evidence if any of that the investigation has. I would also be interested to know the camera blind spots on the property in this context.