Something like this.
Manzanita stands over the bound half orc. "We spared your life, and you have helped us once, for that we are even. If you help us again, we will spare your life and release you, with sufficent equipment to travel to safety. But that won't be until we return again from your hideout. Tell us, now, we have killed about 8 of your comrades, as well as your leader, his dog and his lieutenant. We know there are more inside, but how many? And are there any traps we should be aware of? Remember, if we don't return, you will die here. If we do return safely, you will be set free. Your leader is dead. You've no more business here. There is nothing to lose by telling us what you know."
(how many have we killed? help me guys. 4 in the barracks, 4 more in another room, the leaders and their dog...)