Just tie him up

Your anger subsides for a moment. He is already defeated, you have the tools to render him helpless for the time you need to escape. You kill when necessary, but in this situation you don't need to. A grin sneaks on your face; I can make his predicament unpleasant though.

You are happy to discover that the shackles from your ankles fit his wrists. You move him around until he is laying on his back, the stake in the middle of the hole between his legs. You pull his upper body up so he is leaned over the stake and tie his wrist after looping the connecting chain through the collar on his ankle, forcing him to stay in that position. You then remove his loincloth and stuff it in his mouth before tightening the whip around his head a few times to gag him throughly.

Now for the final stroke. You take the shackles formally on your wrists, way too small to fit on any of his appendages... well there is one it might fit. You give his cock and balls squeeze and stroke it until it is hard again. You see his eyes flutter open, first foggy, then shocked as he realises his peril. You grin at him, "Not so smart after all, big boy.". His expression turn angry and he starts screaming into his gag, which produces very little noise. "Careful, not the time to piss me off.", you say and then quickly lock one of the shackles around the base of his cock. He freezes, shocked. Holding eye-contact, you loop it around the stake once and then lock the other end around his ballsack. Every attempt to escape would now tear at his beloved junk.

"There we go, now be a good **** and wait here until someone finds you without making noise.", you give his face a good, hard smack and then leave him behind in the hole.