oen doesn't see if they pulled a hose line at the left side nearby the entrance into the building. And concerning the Aerial I can imagine that they wanted to reach the rear side of the building, or they simply didn't know until then from where the fire actually comes from
just found another video of the fire: the Aerial you see arriving here was set up at the position where it stood at the end of the video; Another aerial coming in later was set up at the corner of the intersection