Ronda Rousey did something she had never done before tonight (Sat., Feb. 22, 2014) in the main event of UFC 170: "Rousey vs. McMann" at the Mandalay Bay Events Center in Las Vegas, Nevada: She stopped her opponent, Sara McMann, via strikes or, more accurately, she put slammed her knee into her foe's liver so hard it put McMann down for the count. And by "down for the count" I mean referee Herb Dean decided it was enough to call a stoppage to the proceedings. The live audience boisterously booed this, and while the knee was undoubtedly a devastating maneuver, McMann appeared to be no worse for the wear just seconds after clutching at her mid-section. She wasn't defending all that well, sure, but in real time only a second or two had passed. Dean, apparently, thought it best to play it safe. By the time his hands were waving, though, no one was happy, except maybe Rousey, who becomes the first 135-pound female fighter in the UFC to score a knockdown. This also marks the first time she's finished a fight by anything other than armbar. For much more on Rousey's win over McMann click here, and for complete UFC 170 results and blow-by-blow coverage of all the night's action click here.