[He seems to have the same thought as he begins to write notes and calibrations in the margins. Designs and numbers and formulas and though he's still actively talking to Ruby he's focusing on what he's writing.]

Momentum, then. You get an extra kickback from the shot to propel yourself forward. [Yes Hiro that's exactly what she said...] I don't know if that'd help me since I don't have a Semblance. And I don't know how to fire a gun. [A beat.] Has she ever backfired?