During during the 17th century AD, a high reward is given to anyone who can successfully capture a serial thief who is known to be able to travel in and out of any shadows on any surfaces. The moment he or she touches the shadow or any physical contact he or she is immediately teleport into an alternate dimension that mirrors reality.
About the wizard's power
Teleport between reality and shadow realm is triggered solely by will and physical contact of good shadow on any surfaces.
Upon teleporting no time is lapsed.
Staying for prolonged periods of time exceeding 10 minutes is fatal to anyone inside the shadow realm.
Despite everything in the shadow realm is simply a mirror reflection of the real world, the wizard cannot be hurt or contained.
The shadow realm can only be accessed if and only if the wizard allows and have met all conditions stated above.
The wizard cannot move any faster regardless of which dimensions he or she is in.
As long as there is a sharp drop in the density of photons with wavelength falls within the visible light spectrum and the surface area marks by such sudden drops is bigger than a penny is considered a good shadow.
The wizard cannot cast shadow and this phenomenon extends to object that comes into physical contacts with his skin and such effect is temporary.
Also shadow casts onto fog or the likes cannot be used to reduce the complexity. Remember light bulb didn't invent yet, best answer explains how to track the target and then take him or her into custody.
How to capture this serial thief with the ability to move between dimension through shadows?