That was even more of a problem. A bottle was a solution for peeing, but not for other things. "Alright, but if you try anything..." There was a sharp warning note in his voice. "I'll untie your legs, but that's is."
He took the gun and tucked it into his jeans again. "Don't try anything," he said again for emphasis as he crouched down to loosen the bonds that tied O's legs to the chair. "I don't want to shoot you right now but I will if I have to." He stood up and undid the rope that surrounded O and the chair, but left the handcuffs on. Before he let him up, though, he tied the rope around O'd body, pinning his arms to his sides and knotting it behind him.
"Up you go," he said, pulling him to his feet to frog-march him into the bathroom.