Her "partner"
picked their refusing-to-walk 3 year old up by the arm and dragged and shoved him along the pavement, then pushed him towards the ground (he didn't fall) and stormed off, so leaving him unrestrained next to a road? 
She says it's "out of character" for him, what she means is (it's fucking not) that it's the first time he's physically assaulted their child.