I think he described it in the last interview. He said he watched her fall all the way down. Also I think there was a witness who said he dropped to the floor right after she fell. Or maybe he said that himself. Maybe I'm not remembering correctly and he just said he first looked on the floor but either way apparently he looked there first before looking out the window and seeing her fall all the way down. Maybe, if he was actually on the floor, he could see her fall through the lower window? Idk It's hard to visualize without a picture of where he was and knowing his line of vision.