Once Knesh has stopped laughing - it takes a while - he manages to catch enough breath to speak, "How about no? You realize I have a functioning brain and sense of self preservation, yes? No, how it works is I will lower a rope with a bag tied to it, you fill it with treasure and I pull it up - might take a few runs but we have the time. Have the leprechaun make his oath conditional upon me releasing you. I will simply unlock the grate and with you all backed off out of sight raise it up. I will drop you a rope if you need it. But I plan on having enough time to make my escape, because while I trust a leprechaun's oath, I cannot say the same for the rest of you."