You knew the outcome of if you did stab her- jail. Some kids at that age would just continue with the impulse and not...
To some extent, yes I'll say I have impulse control. If I think another person may be in physical danger than I might think about it. I impulsively burn things, break glass, etc., if I'm alone. The less dangerous things would be impulsively throwing something that can't break, switching a light as I pass by, making something fall, etc. All of that is done mindlessly or a blank mind.
After that, she continued on punching and kicking me. She held me by the collar of the shirt and was centimeters away from my face yelling.. eventually she stopped and threw me down before walking away. By that age(around 4th-5th grade) I was already pretty used to my mother's actions so it didn't come as a surprise. I did think my life was in danger when she choked me, when she threatened to crash the car because I wouldn't stay awake in the car with her, or when she'd hit me and yank at my hair in the car which would cause her to not have complete control of the car. Around 7th or 8th grade she threatened to stab me with a kitchen knife and it was maybe half a foot to a foot distance away from my face. She's threatened me before with other things and sometimes followed through such as pouring her hot coffee on me right before school, throwing stuff at me such as shoes, plates and if I couldn't keep them from breaking then she would yell.. she's thrown a chair at me and also threw me while I was on the chair. For some reason though, during the knife I didn't feel like my life was in danger. I can't remember any specific emotions. During some of the times, I felt no emotion and other times I'd feel very angry, bothered/uncomfortable, or lonely/giving up.
When I was younger my mother mainly did the actions but later on at around grade 4 or 5 my father started joining in as well. He'd help hold me down, he's slapped me down while we were in the grocery store, threatened me, but in comparison to my mom, he leaned more into the verbal side of things while my mother did all.
The image I got during my mother holding me against the cupboard was of what could happen if I did stab her. Of her blood on me, the action of it, etc. but as it got too intense, and she stopped, I didn't cry after the whole ordeal. I just stayed on the ground and looked at the carpet's curls until I fell asleep and she called for me later to help her in the kitchen.