The abandoned steel mill is a reference to the demise of the terminators in Terminator 2: Judgment Day (being melted in a vat of molten steel). Much like the T-1000 in the movie, B1000 will "melt" into a puddle when damaged and then reform until killed.
The following is based on unverified behind the scenes information and is speculative and may not be accurate.
The B1000 carrying an UZI is a reference to the terminator's "purchase" of the weapon from a vendor in the first Terminator movie.
End of information based on unverified behind the scenes information.