"Well," Steph says, calmly and coldly, "it's going to be a little hard to get on my bike with you looming over me like that, isn't it?"

The insults get nothing; the shouting gets nothing. She's too busy being dismayed by her own reaction. It never seemed bad before, how easy she finds turning to violence, but standing in front of Rachel and seeing ... what she desperately doesn't want to be her future... it's a problem.