https://www.youtube.com/watch?v=ODidQ7aXp7w
The likely cause is that warlord (or at least this specific amount into warlord) is requiring the non cp-affected threshold, but costing the reduced amount.
72 points in warlord. Breaking free from 100% drops stamina down to 56%, so ~44% stamina is required. However, I am unable to break free without at least ~74% stamina, as is shown in the video. Clearly I need far less than that, as breaking from the first point I am able leaves me with above 30% stamina remaining.