When Alita goes to confront Vector in his HQ, she battles into the hunter-warrior HQ, but then crashes down through the glass ceiling into Vector's penthouse suite.
Why does she crash in through the glass roof and not appear from the door (if she took a lift or something)? Surely if she was going to break through the glass roof, it would be better to scale the outside of the building?
By this point Alita is fully aware that Vector has masses of guards and that those guards have very big guns on a hair trigger. She, according to the official novelisation, took a service elevator to a maintenance level below the penthouse, then climbed up to get access through the skylight. This wisely avoids confronting the Centurians in the narrow hallway outside the elevator, an obvious chokepoint for an ambush.
Past the bounty platform, she saw a bank of three elevators. Two went no higher than the floor where Vector’s office and penthouse suite were located. The third stopped on the level below, where there was maintenance access.
* * *
Vector had already been waiting several hours for dispatch to pick up the cabinet in his office and send it up to Zalem when the alert came in from Security. The cyborg girl his hired thugs had failed to kill, Alita, was coming up the front steps, and she was obviously loaded for bear. After the past couple of days, he wasn’t in the mood for any more of her steel-assed bullshit and he’d set the Centurians to “Overkill”. After they obliterated her, he intended to send whatever was left up in a plastic bag to the Watcher. If Nova wanted her heart so bad, he could piece it back together like a jigsaw puzzle.
Vector was pretty sure the Centurians would close Alita’s case before she got as far as the bounty platform. But the gunfire went on and on and Vector began to get annoyed. It was one thing for a gang of hired killers to screw up—it wasn’t like any of them were geniuses. But Centurians had big guns, a perfect aim, and they couldn’t be outsmarted or distracted in a limited space like the entry hall.
When the sound of gunfire finally died away, Vector stabbed the intercom key.
...
Still nothing. Someone was definitely going to die before the day was out. He was trying to decide who and how many when his skylight exploded.
Shards of glass rained down on him, cutting his face and hands, sticking in his hair and clothing. He tried to brush himself off and ended up pushing the glass even deeper into his skin.
