"I wouldn't need to do that if you didn't throw your only weapon," Emerald lectured, dropping her sword as requested. Of course she had no way of knowing that this woman wouldn't pick it up and attack her with it the moment she got her hands on another weapon. But, if Emerald wanted to earn her trust, she had to show that she could be trusted. Plus, she had a back up encase things turned fighty.
And so, Emerald kicked her sword across the floor to Tundra. "I don't know how much time we have," she said., "I just came in her to find myself a momentary reprieve. But Sontaran soldiers can be on our asses at any moment. I don't know what they're planning, or why you're here, but I'm going to find out."