The first picture you mentioned occurs when she breaks your neck. This can happen if you pick up a key in front of her after she knocks you down or if you mess with her too much. If you close a door right before she goes through it or open it in her face, she will slowly get angry. If you do it enough times, she will run you down and break your neck. Her dialogue changes from 'Stop it' to 'I'm Upset' as she gets angrier before she finally says '...' and kills you.
I have yet to see the locker one but it wouldn't surprise me if there were a couple animations that are uncommon.