Michael is one of 2 thieves that can be caught stealing from house in Baldur's Gate Southeast. He and Taxek can be found in the house at 1730, 1090.
Engage Michael in melee quickly, or he will begin using up his Arrows of Fire on you!
The pair have done a thorough job. Bootable containers in the house are mostly empty, with only a Quarterstaff, 4 Throwing Axes and a History of Waterdeep II remaining.
Confronting Taxek and Michael