I've watched the video several times and I'm no fan of Decker/Tabb/Slaney but it still looks to me like Budd is mainly to blame for The Fall. Either shit or get off the pot. Pass Slaney or don't pass her but don't keep easing into her for 150+ meters.
Of course, Slaney could have defended her position better, sped up, or ceded her position. Budd was content to run about 4 laps on the outside of lane 1, what was the hurry to go to the inside at that point, anyway?
I'm going to assign 55% of blame to Budd and 45% to Slaney.