[luvbach1]

Cops would also know the size of the cells, the concrete bench and what would likely happen if you shove a drunk towards a cell wall and bench.

He probably shoved other arrestees similarly into the cells without causing the injury that occurred so he probably was surprised at what happened. The lady's light weight made her move with greater force than with a heavier prisoner. Not excusing the cop. He was at fault. But he probably didn't intend to cause the serious injury he did.

[RFEngineer]

“But he probably didn’t intend to cause the serious injury he did. “

Unfortunately, to be consistent, you must then assume that by being by the side of the road, the woman didn’t intend to drive drunk.

But she was arrested, as should this guy be.