Except as I said, after that she was back to limping and barely able to make it across the compound.
So possible short burst using her good, i.e. less injured side for the take down. So her motor bike just happens to be near the bar? Sorry, I cannot remember how that was explained and managed to work when nothing else needed a motor was. Why wasn't it offered to Harry who was forced to "borrow" a bicycle.
I'm not saying this is a good explanation at all.. But here is the in-book explanation that was given:
Battle Ground, Ch 16:
“Uh . . .” Butters said, drawing the sound out. “Now, don’t be mad, Harry.”
“What?” I asked, and I might have sounded a little grumpy.
“Me and Sanya kind of wound up by Mac’s place,” he said.
“Butters,” I said warningly.
“We took a vote,” he said.”
and a few pages later...
“I eyed the motorcycle. Then her. “How?”
“Like I don’t keep this old baby behind wards,” she said. “The Ordo Lebes did it for me years ago. And bikes are the only things that can get through the streets.”
Also a good warrior knows when he should stay out of the fight injured as she was least she become part of the problem. Considering the deep end Harry went off that almost was irreversible when she killed, it was something she failed to take into consideration when she left her assigned post. Or how would she have felt if people were hurt or killed in and around the bar in spite of the Placard protections because she wasn't there to do her job?
Why should Murphy think about the consequences of her death on Harry? Harry never did the same. If we hold Murphy accountable for not thinking about the consequences of her own death on Harry, shouldn't we hold Harry accountable for not thinking about the consequences of his own death on his daughter, Karrin or Thomas, for example?
In Changes Harry doesn't care the price he pays, it's his price according to him, but they all end up paying the consequences, all his friends. His death had consequences on all of those who went and help him save his daughter. But he couldn't stop to think about that, the most important person in the world for him was in danger.
In Murphy's case in Battle Ground, the most important person in the world was Harry, it's been obvious since Cold Days, that's where (rightly or not) her mind and heart are. I think it's about being in love with him, but also because she believed that he was necessary to save Chicago, certainly more necessary than she herself was. Mac's was supposed to be protected. She wanted to do everything she could to help Harry, and if the price was her life, so be it. In the end it was.
Right, she wasn't thinking straight, but I don't think she had any obligation to think about what Her death would to do Harry, it was more important that he lived first. Same way Harry never did think about that sort of thing, he only thought about what he could or should do to save his daughter back in Changes when he was injured beyond repair and made the bargain that would condemn him. That's some of what they talked about in the boat in PT. We went through that line of thinking, being responsible for others in Ghost Story and Skin Game. Michael advised that no, Harry was not responsible for not foreseeing all the consequences of the decisions made in Changes, when he gets himself killed. Why should Murphy need to think about what he'll do after her death when there was a chance of him not even surviving the night?