I think she felt the recoil of the bullet being pushed back into the gun, causing her hand to go astray, leaving enough time for her to be tackled by the cops. Since Hiro doesn't have any sort of telekinesis powers, he must've went back in time a few seconds (but that still doesn't really explain how her gun got pushed out of the way... unless it was the recoil).
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Another example of space manipulation is when he traveled from Japan to New York (in the future.) Still, warping from Japan to New York and stopping a bullet doesn't really seem like related powers. I hope they explain it in later episodes.
