...she's able to deflect bullets with a sword. As far as we've seen, she's a normal human with no powers. All of a sudden she becomes a super ninja with no explanation.
Also, how is she The Mechanic when nothing about that name has been mentioned anywhere other then the cast list. Did Cisco give her a name in an episode?
That's what I'm saying! She's just a human! Humans can't react that fast. Once we hear the gunshot its already hit us. As far as the name, I think Cisco did call her that in one of the early episodes this season.
shareIt appears to be some type of "super sword" as evidenced by the electricity enveloping it. I'm speculating, but perhaps it automatically reacts and shifts to protect it's keeper. But they never explain it...
PS: for those original Metal Gear Solid fans reminds me of Gray Fox's sword