Uh oh, you think to yourself as your vision begins to blur. Given your current situation, right now is not exactly the best time for a nap.
Although you're still on your feet, to an extent, the guard is already advancing on you. You're not quite sure, but it looks like he's reaching for a set of handcuffs; substantially more difficult to get out of than the leather restraints that held you previously, you're sure. At the very least, though, it could be a sign that the guard doesn't actually have any of that nanomechanical potion or whatever it was that the woman tried to inject you with.
Fortunately enough, the mere thought of the woman and the bizarre transformation plan is enough to bring you to your senses, at least partially. The cloud in your mind clears enough for you to realize that the guard is almost upon you. With as much strength as you can muster, you bite down on your tongue. Hard.
The pain is like a shock to your system, and you're full awake instantaneously. What's more, lady luck is on your side once again, and the guard is caught unawares as you lash out with your good leg.
Like a sack of potatos, the guard hits the ground with a reassuring thud. Taking advantage of his momentary disorientation, you clock him one upside the head, puting his lights out.
"Well," you grunt, the tangy flavor of your own blood filling your mouth, "that was invigorating."