Bad day to go poking around strange and unknown magical gates huh? Granted few days are good for that, but even so, it seems this one is worse than usual. He'd begin moving away from the man and dragon, heading for the shadows as a smirk forms on his face.
"Lumen, Camerus, Factum..."
As he mutters that and waves his hand, a copy of himself would begin to take shape where he'd once stood. Shimmering a bit, but without looking closely one might think he's simply gathering magic. Of course, he'd also begin speaking, as his voice comes from the illusion rather than himself.
"HEY JACKASS! PICK A FIGHT WITH SOMEONE WHO CAN TAKE YA!"
From the corner of the caves he'd move his hand forward, the illusion of himself rushing at his foe's back and shouting all the while... Even as Harry reaches into his coat and pulls out a rather large revolver. He'd train it on the man's chest as his illusion closes to about 30 feet. From there, it would keep on charging and prepare to swing its staff. Of course, assuming that his foe believes "Dresden" to be real he'd likely lash out. Maybe even taking the chance to try and finish a foe off as the illusion swings its staff up in a wide arc, large amounts of light gathering in the staff and even the feeling of magic being focused into it... Which it is, but the purpose is simply to make this look like a foolhardy attempt at an attack. If his foe didn't respond and allowed himself to be struck, the blow would pass through harmlessly. If he followed his instincts and countered at the clear opening, however, well that'd be great by Harry.